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TZID:Europe/Paris
X-WR-TIMEZONE:Europe/Paris
BEGIN:VEVENT
UID:9161@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261217T110000
DTEND;TZID=Europe/Paris:20261217T120000
DTSTAMP:20260706T150631Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17-202
 6-09-24-2026-10-01-2026-10-08-2026-10-15-2026-10-22-2026-10-29-2026-11-05-
 2026-11-12-2026-11-19-2026-11-26-2026-12-03-2026-12-10-2026-12-17/
SUMMARY: (...): TBA
DESCRIPTION:: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9141@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261210T110000
DTEND;TZID=Europe/Paris:20261210T120000
DTSTAMP:20260630T130410Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-303/
SUMMARY:Amandine Escalier (Lyon): TBA
DESCRIPTION:Amandine Escalier: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9159@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261203T110000
DTEND;TZID=Europe/Paris:20261203T120000
DTSTAMP:20260714T131634Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17-202
 6-09-24-2026-10-01-2026-10-08-2026-10-15-2026-10-22-2026-10-29-2026-11-05-
 2026-11-12-2026-11-19-2026-11-26-2026-12-03/
SUMMARY:Claudia Stadlmayr (Neuchâtel): TBA
DESCRIPTION:Claudia Stadlmayr: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9143@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261126T110000
DTEND;TZID=Europe/Paris:20261126T120000
DTSTAMP:20260701T200447Z
URL:https://www.i2m.univ-amu.fr/evenements/shreyasharma/
SUMMARY:Shreya Sharma (Université de Bâle): TBA
DESCRIPTION:Shreya Sharma: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9157@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261119T110000
DTEND;TZID=Europe/Paris:20261119T120000
DTSTAMP:20260707T140715Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17-202
 6-09-24-2026-10-01-2026-10-08-2026-10-15-2026-10-22-2026-10-29-2026-11-05-
 2026-11-12-2026-11-19/
SUMMARY:Thi Nguyen (Orsay): TBA
DESCRIPTION:Thi Nguyen: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9156@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261112T110000
DTEND;TZID=Europe/Paris:20261112T120000
DTSTAMP:20260711T082102Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17-202
 6-09-24-2026-10-01-2026-10-08-2026-10-15-2026-10-22-2026-10-29-2026-11-05-
 2026-11-12/
SUMMARY:Marco Linton (Madrid): TBA
DESCRIPTION:Marco Linton: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9155@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261105T110000
DTEND;TZID=Europe/Paris:20261105T120000
DTSTAMP:20260706T150631Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17-202
 6-09-24-2026-10-01-2026-10-08-2026-10-15-2026-10-22-2026-10-29-2026-11-05/
SUMMARY: (...): TBA
DESCRIPTION:: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9153@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261022T110000
DTEND;TZID=Europe/Paris:20261022T120000
DTSTAMP:20260709T130653Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17-202
 6-09-24-2026-10-01-2026-10-08-2026-10-15-2026-10-22/
SUMMARY:Vincent Colin (Rennes): TBA
DESCRIPTION:Vincent Colin: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9152@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261015T110000
DTEND;TZID=Europe/Paris:20261015T120000
DTSTAMP:20260706T151358Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17-202
 6-09-24-2026-10-01-2026-10-08-2026-10-15/
SUMMARY:Julien Moy (Orsay): TBA
DESCRIPTION:Julien Moy: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9151@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261008T110000
DTEND;TZID=Europe/Paris:20261008T120000
DTSTAMP:20260710T090837Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17-202
 6-09-24-2026-10-01-2026-10-08/
SUMMARY:Pierre Will (Grenoble): TBA
DESCRIPTION:Pierre Will: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9150@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20261001T110000
DTEND;TZID=Europe/Paris:20261001T120000
DTSTAMP:20260710T055818Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17-202
 6-09-24-2026-10-01/
SUMMARY:Martin Leguil (Polytechnique): TBA
DESCRIPTION:Martin Leguil: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9142@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260924T110000
DTEND;TZID=Europe/Paris:20260924T120000
DTSTAMP:20260701T192829Z
URL:https://www.i2m.univ-amu.fr/evenements/anastasiavikulova/
SUMMARY:Anastasia Vikulova (Université de Bâle): TBA
DESCRIPTION:Anastasia Vikulova: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9148@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260917T110000
DTEND;TZID=Europe/Paris:20260917T120000
DTSTAMP:20260706T150631Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10-2026-09-17/
SUMMARY: (...): TBA
DESCRIPTION:: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9147@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260910T110000
DTEND;TZID=Europe/Paris:20260910T120000
DTSTAMP:20260706T150631Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2-2026-09-10/
SUMMARY: (...): TBA
DESCRIPTION:: 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9144@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260716T140000
DTEND;TZID=Europe/Paris:20260716T170000
DTSTAMP:20260703T131134Z
URL:https://www.i2m.univ-amu.fr/evenements/homologie-cyclique-des-algebres
 -produits-croises-lisses-une-methode-de-dirac-dual-dirac-en-homologie-cycl
 ique-periodique/
SUMMARY:Axel Gastaldi (I2M): Homologie cyclique des algèbres produits croi
 sés lisses\, une méthode de Dirac-dual Dirac en homologie cyclique péri
 odique
DESCRIPTION:Axel Gastaldi: Jury\n\n 	Robert Yuncken (rapporteur) - Professe
 ur à l'Institut Élie Cartan de Lorraine\n 	Christian Voigt (rapporteur) 
 - Professeur à l'Université de Glasgow\n 	Victor Nistor (président du j
 ury) - Professeur à l'Institut Élie Cartan de Lorraine\n 	Indira Chatter
 ji (examinatrice) - Professeure au laboratoire J.A. Dieudonné\n 	Pierre C
 lare (examinateur) - Professeur associé à l'Université William &amp\; M
 ary\n 	Christophe Pittet (examinateur) - Professeur à l'Université d'Aix
 -Marseille\n 	Michael Puschnigg (directeur de thèse) - Professeur à l'Un
 iversité d'Aix-Marseille\n\n\n\nRésumé :\n\nCette thèse est dédiée 
 à l’étude des algèbres de convolution lisses associées aux groupes
  de Lie\, apparaissant naturellement en géométrie non-commutative et e
 n théorie des représentations. Notre résultat établit un isomorphism
 e\, après stabilisation\, entre l’homologie cyclique périodique des a
 lgèbres produits croisés lisses associées à un groupe de Lie réel e
 t à son sous groupe compact maximal\, produisant un analogue homologique
  de l’induction de Dirac à coefficients pour les groupes de Lie.\nNot
 re approche repose sur les travaux de Nistor qui établit cet isomorphisme
  localement\, c’est-à-dire au-dessus de chaque classe de conjugaison du
  groupe\, et sans stabilisation. Les outils principaux utilisés provien
 nent de la K-théorie bivariante de Kasparov et de sa description par Cu
 ntz. Nous proposons un raffinement de la méthode de Dirac-dual Dirac et d
 e la notion d’équivalence de Morita pour une adaptation à notre cadr
 e.\n\nMots clés : Géométrie non-commutative\, Algèbres de convolution\
 , Homologie cyclique\, K-théorie\, K-théorie bivariante\, Groupes de Li
 e\, Théorie des représentations.\nAbstract:\nThis thesis is devoted to t
 he study of smooth convolution algebras associated to Lie groups\, appear
 ing naturally in non-commutative geometry and representation theory. Our 
 result establishes a stable isomorphism between the periodic cyclic homolo
 gy of the smooth crossed product algebras associated to a real Lie group 
 and to its maximal compact subgroup. It may be viewed an homological anal
 ogue to the Dirac induction with coefficients for Lie groups.\nOur approa
 ch is built on earlier work of Nistor who established this isomorphism lo
 cally\, i.e. around each conjugacy class of the group and without stabiliz
 ation. Essential tools come from Kasparov’s bivariant K-theory and its i
 nterpretation by Cuntz. We set up a refinement of the Dirac-dual Dirac me
 thod and of Morita equivalence which fit into our framework.\n\nKeywords:
  Non-Commutative geometry\, Convolution algebras\, Cyclic homology\, K-the
 ory\, bivariant K-theory\, Lie groups\, Representation theory.\n
CATEGORIES:Soutenance de thèse,AGLR
LOCATION:Luminy - Amphi 12\, Campus de Luminy\, Marseille\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Campus de Luminy\, Marseill
 e\, France;X-APPLE-RADIUS=100;X-TITLE=Luminy - Amphi 12:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9163@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260716T110000
DTEND;TZID=Europe/Paris:20260716T123000
DTSTAMP:20260707T092550Z
URL:https://www.i2m.univ-amu.fr/evenements/wiring-the-%cf%80-calculus-to-d
 enotational-semantics/
SUMMARY:Ken Sakayori (University of Tokyo): Wiring the π-calculus to Denot
 ational Semantics
DESCRIPTION:Ken Sakayori: 
CATEGORIES:Séminaire,Logique et Interactions
LOCATION:I2M Luminy - TPR2\, Salle de Séminaire 304-306 (3ème étage)\, 1
 63 Avenue de Luminy\, Marseille\, 13009\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, Mars
 eille\, 13009\, France;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - TPR2\, Sall
 e de Séminaire 304-306 (3ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:8825@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260710T110000
DTEND;TZID=Europe/Paris:20260710T120000
DTSTAMP:20250915T115244Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2025-09-12-2025-09-19-2025-
 09-26-2025-10-03-2025-10-10-2025-10-17-2025-10-24-2025-10-31-2025-11-07-20
 25-11-14-2025-11-21-2025-11-28-2025-12-05-2025-12-12-2025-12-19-2025-12-26
 -2026-0-03-2026-07-10/
SUMMARY: (...): TBA
DESCRIPTION:: 
CATEGORIES:Séminaire,Rauzy
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9162@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260709T110000
DTEND;TZID=Europe/Paris:20260709T123000
DTSTAMP:20260707T092233Z
URL:https://www.i2m.univ-amu.fr/evenements/correspondences-between-codensi
 ty-and-coupling-based-liftings-a-practical-approach/
SUMMARY:Samuel Humeau (LIS): Correspondences between codensity and coupling
 -based liftings\, a practical approach.
DESCRIPTION:Samuel Humeau: The Kantorovich distance is a widely used metric
  between probability\ndistributions. The Kantorovich-Rubinstein duality st
 ates that it can be\ndefined in two equivalent ways: as a supremum\, based
  on non-expansive\nfunctions into [0\,1]\, and as an infimum\, based on pr
 obabilistic couplings.\nOrthogonally\, there are categorical generalisatio
 ns of both\npresentations proposed in the literature\, in the form of code
 nsity\nliftings and what we refer to as coupling-based liftings. Both lift
 \nendofunctors on the category Set of sets and functions to that of\npseud
 ometric spaces\, and both are parameterised by modalities from\ncoalgebrai
 c modal logic.\nA generalisation of the Kantorovich-Rubinstein duality has
  been more\nnebulous - it is known not to work in some cases. In this pape
 r we\npropose a compositional approach for obtaining such generalised\ndua
 lities for a class of functors\, which is closed under coproducts and\npro
 ducts. Our approach is based on an explicit construction of\nmodalities an
 d also applies to and extends known cases such as that of\nthe powerset fu
 nctor.
CATEGORIES:Séminaire,Logique et Interactions
LOCATION:Luminy - LIS\, salle 04.02\, Campus de Luminy\, Marseille\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Campus de Luminy\, Marseill
 e\, France;X-APPLE-RADIUS=100;X-TITLE=Luminy - LIS\, salle 04.02:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:8824@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260703T110000
DTEND;TZID=Europe/Paris:20260703T120000
DTSTAMP:20260630T123139Z
URL:https://www.i2m.univ-amu.fr/evenements/rauzy-2026-07-03/
SUMMARY:Cristobal RIVAS (Departamento de Matemática de la Universidad de C
 hile): Smoothing group of homeomorphisms of the real line: the case of Bau
 mslag-Solitar groups
DESCRIPTION:Cristobal RIVAS: Given a group of homeomorphisms of the real li
 ne\, a natural problem is to try to understand when this group is conjugat
 e to a group of diffeomorphisms\, and also to elucidate the optimal regula
 rity within the conjugacy class. This program has shown to be fruitful in 
 the class of abelian\, and nilpotent\, groups as well as for some families
  of right-angled Artin groups. In this talk\, I will report on a recent pr
 oject joint with Franco Gomez\, where we address this problem for the case
  of the Baumslag-Solitar groups BS(m\,n).
CATEGORIES:Séminaire,Rauzy
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9140@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260702T110000
DTEND;TZID=Europe/Paris:20260702T123000
DTSTAMP:20260626T155016Z
URL:https://www.i2m.univ-amu.fr/evenements/1-%e2%8a%a5-in-mll/
SUMMARY:Olivier Laurent (ÉNS de Lyon): 1 = ⊥ in MLL
DESCRIPTION:Olivier Laurent: The introduction of units in multiplicative li
 near logic (MLL) makes syntactic properties much more complex\, in particu
 lar regarding the question of identity of proofs and thus of proof nets. S
 tarting from the well known relation between the axioms 1 ⊢ ⊥ and ⊥ 
 ⊢ 1 and the mix rules\, we study which equivalence on sequent-calculus p
 roofs provides a syntactic isomorphism 1 ≃ ⊥. This leads to the introd
 uction of MLLM\, a variant of MLL with a self dual unit identifying 1 and 
 ⊥.\nMoving to the categorical side of the Curry-Howard-Lambek correspond
 ence\, we give a semantic counterpart of the previous syntactic constructi
 on in symmetric monoidal closed and *-autonomous categories.
CATEGORIES:Séminaire,Logique et Interactions
LOCATION:I2M Luminy - TPR2\, Salle de Séminaire 304-306 (3ème étage)\, 1
 63 Avenue de Luminy\, Marseille\, 13009\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, Mars
 eille\, 13009\, France;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - TPR2\, Sall
 e de Séminaire 304-306 (3ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9088@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260630T143000
DTEND;TZID=Europe/Paris:20260630T153000
DTSTAMP:20260501T092140Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-300/
SUMMARY:Meltem ÜNEL (Université Paris 13): Les arbres biaisés par la hau
 teur: quelques nouveaux résultats
DESCRIPTION:Meltem ÜNEL: Étant donné $\\mu \\in \\mathbb{R}$\, un arbre 
 de taille $n$ biaisé par la hauteur est un arbre planaire aléatoire $T_n
 $ à $n$ sommets dont la loi est donnée par $P(T_n = t ) \\propto e^{−\
 \mu h(t)}$\, où $t$ est un arbre fixe à $n$ sommets\, et $h(t)$ est la h
 auteur de $t$ .\nDans cet exposé on va présenter quelques statistiques d
 e ces arbres quand $\\mu=\\mu(n)$ est une suite à termes positifs dépend
 ant de $n$: notamment sa hauteur ainsi que sa largeur\, qui s’avèrent 
 être différents du cas uniforme.\nL’exposé est basé sur arXiv:2512.1
 7747 en commun avec L. Addario-Berry\, B. Corsini et N. Maitra.
CATEGORIES:Séminaire,ALEA,Probabilités
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9095@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260630T140000
DTEND;TZID=Europe/Paris:20260630T150000
DTSTAMP:20260624T221722Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-304/
SUMMARY:Justin Trias (I2M- CNRS): Autour de la correspondance de Langlands 
 sauvagement ramifiée et de la correspondance thêta
DESCRIPTION:Justin Trias: Cet exposé se base sur un travail en cours avec 
 Jia-Jun Ma\, Hung Yean Loke et Shaun Stevens. J'expliquerai notre stratég
 ie pour étendre la correspondance de Langlands sauvagement ramifiée expl
 icite au cas des groupes orthogonaux. Cette version de la correspondance d
 e Langlands stipule qu'il existe une bijection entre les endoparamètres d
 'un côté et les paramètres sauvages de l'autre. Nous partons du cas dé
 jà connu des groupes symplectiques\, d'après les travaux de Blondel-Henn
 iart-Stevens\, pour obtenir le cas orthogonal à l'aide de la correspondan
 ce thêta.
CATEGORIES:Séminaire,AGLR,Représentations des Groupes Réductifs
LOCATION:I2M Luminy - TPR2\, Salle de Séminaire 304-306 (3ème étage)\, 1
 63 Avenue de Luminy\, Marseille\, 13009\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, Mars
 eille\, 13009\, France;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - TPR2\, Sall
 e de Séminaire 304-306 (3ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9073@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260629T140000
DTEND;TZID=Europe/Paris:20260629T153000
DTSTAMP:20260622T070500Z
URL:https://www.i2m.univ-amu.fr/evenements/seminaire-de-pierre-latouche/
SUMMARY:Pierre Latouche (UCA): Séminaire de Pierre Latouche
DESCRIPTION:Pierre Latouche: Title: Importance weighted variational graph a
 utoencoders for inference in deep latent position block models\n\nAbstract
 :\n\nIn this presentation\, I will first show how latent position models c
 an be made compatible with block models for network analysis through the u
 se of deep generative models. I will focus on the binary edge case and int
 roduce a new random graph model along with a variational graph auto encodi
 ng strategy for inference. I will discuss the identifiability of the model
  and explain how model selection can be performed. I will then move to the
  sparse discrete edge case in the same deep\, block compatible\, modelling
  framework. I will show how importance weighted variational inference can 
 strongly improve the inference procedure over the classical variational au
 to encoding strategy. I will give the importance weights used for sampling
  and show that\, in the limit\, the lower bound obtained converges to the 
 integrated log likelihood of the data. Through this presentation\, I will 
 emphasise the need to rely on flexible random graph models to obtain relev
 ant loss functions.
CATEGORIES:Séminaire,Statistique
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:8823@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260626T110000
DTEND;TZID=Europe/Paris:20260626T120000
DTSTAMP:20250915T115244Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2025-09-12-2025-09-19-2025-
 09-26-2025-10-03-2025-10-10-2025-10-17-2025-10-24-2025-10-31-2025-11-07-20
 25-11-14-2025-11-21-2025-11-28-2025-12-05-2025-12-12-2025-12-19-2025-12-26
 -2026-0-19-2026-06-26/
SUMMARY: (...): TBA
DESCRIPTION:: 
CATEGORIES:Séminaire,Rauzy
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9139@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260625T170000
DTEND;TZID=Europe/Paris:20260625T174500
DTSTAMP:20260625T181301Z
URL:https://www.i2m.univ-amu.fr/evenements/algorithm-development-to-track-
 intracellular-particles/
SUMMARY:Piyush Mishra (I2M): Algorithm development to track intracellular p
 articles
DESCRIPTION:Piyush Mishra: Abstract : Understanding intracellular processe
 s requires accurately tracking individual molecules in live-cell microscop
 y data. This is challenging because imaging noise and high particle densit
 y create many possible trajectory assignments. We combine transformer-base
 d attention mechanisms to identify the most likely trajectory hypotheses w
 ith Bayesian tracking to reconstruct particle motion. This hybrid approach
  improves robustness and doubles tracking performance compared with conven
 tional methods.
CATEGORIES:Séminaire,Rencontres doctorant⋅es I2M-CPT
LOCATION:I2M Luminy - TPR2\, Salle de Séminaire 304-306 (3ème étage)\, 1
 63 Avenue de Luminy\, Marseille\, 13009\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, Mars
 eille\, 13009\, France;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - TPR2\, Sall
 e de Séminaire 304-306 (3ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9092@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260625T103000
DTEND;TZID=Europe/Paris:20260625T161500
DTSTAMP:20260507T133103Z
URL:https://www.i2m.univ-amu.fr/evenements/seminaire-chocola-a-lyon-22/
SUMMARY:Gavazzo\, Lancelot\, TBA (LIP\, ENS Lyon): Séminaire Chocola à Ly
 on
DESCRIPTION:Gavazzo\, Lancelot\, TBA: 
CATEGORIES:Séminaire,Logique et Interactions
LOCATION:ENSL - École normale supérieure de Lyon\, 15 parvis René Descar
 tes\, Lyon\, France\, 69342\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 parvis René Descartes\,
  Lyon\, France\, 69342\, France;X-APPLE-RADIUS=100;X-TITLE=ENSL - École n
 ormale supérieure de Lyon:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9108@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260623T143000
DTEND;TZID=Europe/Paris:20260623T153000
DTSTAMP:20260616T220126Z
URL:https://www.i2m.univ-amu.fr/evenements/orthogonal-polynomial-ensemble-
 and-their-deformations/
SUMMARY:Thomas CHOUTEAU (Universidade de São Paulo): Orthogonal Polynomial
  Ensemble and their deformations.
DESCRIPTION:Thomas CHOUTEAU: Orthogonal Polynomial Ensembles (OPEs) are an 
 important class of\ndeterminantal point processes arising naturally from f
 amilies of orthogonal\npolynomials. Their structure is encoded in their co
 rrelation functions\,\nwhich can be expressed in terms of the associated C
 hristoffel–Darboux\nkernel.\n\nIn this talk\, I will first introduce OPE
 s from a probabilistic perspective\nand explain how orthogonal polynomials
  naturally enter the picture.\nParticular interest will be placed on the r
 ole of the Christoffel–Darboux\nkernel and on classical connections with
  random matrix theory\, including\nuniversality phenomena in the large-par
 ticle limit.\n\nIn the second part of the talk\, I will discuss a class of
  deformations of\nOPEs that can be interpreted as a thinning of the underl
 ying point process.\nFocusing on a bulk critical scaling regime\, I will p
 resent recent joint\nwork with collaborators in Brazil showing how the lar
 ge-scale behavior of\nthe particles is governed by an integrable structure
  involving an\nintegro-differential Painlevé V equation.\n\nThis presenta
 tion is based on the paper *Deformations of Orthogonal\nPolynomial Ensembl
 es in a Bulk Critical Scaling* (*Nonlinearity*) and was\npartially support
 ed by FAPESP projects 23/10533-8 and 25/06240-0.
CATEGORIES:Séminaire,ALEA,Probabilités
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9072@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260622T140000
DTEND;TZID=Europe/Paris:20260622T153000
DTSTAMP:20260413T130837Z
URL:https://www.i2m.univ-amu.fr/evenements/seminaire-dantoine-moll/
SUMMARY:Antoine Moll (...): Séminaire d'Antoine Moll
DESCRIPTION:Antoine Moll: Antoine nous parlerra d'"Improving Fairness in th
 e Detection of Undiagnosed Diabetes without Increasing Loss Ratio" dont vo
 ici un résumé :\n\nUndiagnosed diabetes is a significant source of risk 
 misclassifications in life and health insurance underwriting\, affecting m
 ortality\, disability\, and critical illness assessments. Because many app
 licants are unaware of their condition\, insurers relying solely on self-r
 eported information may underestimate true medical risk. This study examin
 es how complementary screening strategies can improve the detection of und
 iagnosed diabetes while controlling medical testing costs and enhancing fa
 irness strategy of testing.\nUsing data from the National Health and Nutri
 tion Examination Survey (NHANES) linked to mortality follow-up\, several s
 creening strategies are evaluated\, ranging from simple questionnaires to 
 a model without constraints. Logistic regression and gradient boosting mod
 els are used to estimate the probability of undiagnosed diabetes\, while m
 ortality is modeled using Cox proportional hazards. Economic performance i
 s evaluated through a loss ratio framework that incorporates underwriting 
 costs.\nA screening strategy combining a medical examination with a urine 
 albumin to creatinine test markedly improves detection and mortality segme
 ntation while remaining cost efficient. Testing about 30-40% of the highes
 t risk applicants maximizes underwriting gains but it creates unfairness a
 nd methods are developed to improve fairness.
CATEGORIES:Séminaire,Statistique
END:VEVENT
BEGIN:VEVENT
UID:8822@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260619T110000
DTEND;TZID=Europe/Paris:20260619T120000
DTSTAMP:20260616T080827Z
URL:https://www.i2m.univ-amu.fr/evenements/rauzy-2026-06-19/
SUMMARY:Jérémie CHALOPIN (LIS\, CNRS\, université d'Aix-Marseille): Grap
 hes et groupes de Helly
DESCRIPTION:Jérémie CHALOPIN: Une famille d'ensemble F satisfait la propr
 iété de Helly si toute\nsous-famille F' dont les ensembles s'intersecten
 t deux à deux à une\nintersection non-vide. Un graphe G est un graphe de
  Helly si la\nfamille des boules de G satisfait la propriété de Helly. U
 n groupe\nest un groupe de Helly s'il agit géométriquement sur un graphe
  de\nHelly. Des exemples de groupes de Helly sont les groupes\nhyperboliqu
 es ou les groupes cubiques CAT(0).\n\nDans cet exposé\, on donnera quelqu
 es propriétés des graphes et des\ngroupes de Helly. En particulier\, on 
 présentera une caractérisation de\ntype local-to-global des graphes de H
 elly et on expliquera pourquoi\nles groupes de Helly sont biautomatiques.\
 n\nCet exposé est basé sur des travaux (pas si récents) communs avec\nV
 ictor Chepoi\, Anthony Genevois\, Hiroshi Hirai et Damian Osajda.
CATEGORIES:Séminaire,Rauzy
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9138@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260618T170000
DTEND;TZID=Europe/Paris:20260618T174500
DTSTAMP:20260625T181057Z
URL:https://www.i2m.univ-amu.fr/evenements/braid-groups/
SUMMARY:Sergio Cia (I2M): Braid groups
DESCRIPTION:Sergio Cia: Abstract : During this talk\, we will talk about b
 raids. See you on Thursday.\n\n\n\n\nOk\, I will explain a bit more: gener
 ally defined as interlaced hair strands\, or threads\, or other intertwine
 d stuff\; they can be studied as a mathematical object\, which makes them 
 even more cool\, stylish and awesome! :D\n\nIn this talk\, we will start b
 y giving a geometric\, intuitive definition of braids. Then\, we will give
  a topological definition\, as well as a presentation of them as an abstra
 ct group. Finally\, if time permits\, we will relate these definitions of 
 braid groups with finite symmetric groups\, and give some applications in
   mathematics (knot theory) and (particle) physics.\n\n\n
CATEGORIES:Séminaire,Rencontres doctorant⋅es I2M-CPT
LOCATION:I2M Luminy - TPR2\, Salle de Séminaire 304-306 (3ème étage)\, 1
 63 Avenue de Luminy\, Marseille\, 13009\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, Mars
 eille\, 13009\, France;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - TPR2\, Sall
 e de Séminaire 304-306 (3ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9109@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260618T110000
DTEND;TZID=Europe/Paris:20260618T123000
DTSTAMP:20260618T121311Z
URL:https://www.i2m.univ-amu.fr/evenements/sound-operational-game-semantic
 s-in-type-theory/
SUMMARY:Peio Borthelle (Inria\, ÉNS de Lyon): Sound Operational Game Seman
 tics in Type Theory
DESCRIPTION:Peio Borthelle: Operational Game Semantics (OGS) is a flexible 
 method for building models for open programs based on their operational se
 mantics. After motivating and giving a high-level overview of an OGS model
 \, I will present the most important constructions from my PhD thesis. Thi
 s will encompass: a high-level axiomatization of abstract machines\, used 
 to build a (reasonably) language-generic OGS model\; a practical represent
 ation for games and their strategies\, usable in intensional type theories
  such as Rocq\; a high-level proof sketch of the soundness of our generic 
 OGS model w.r.t. contextual equivalence. 
CATEGORIES:Séminaire,Logique et Interactions
LOCATION:I2M Luminy - TPR2\, Salle de Séminaire 304-306 (3ème étage)\, 1
 63 Avenue de Luminy\, Marseille\, 13009\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, Mars
 eille\, 13009\, France;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - TPR2\, Sall
 e de Séminaire 304-306 (3ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9099@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260616T143000
DTEND;TZID=Europe/Paris:20260616T153000
DTSTAMP:20260511T143206Z
URL:https://www.i2m.univ-amu.fr/evenements/phase-transitions-in-charged-po
 lymer-models/
SUMMARY:Julien POISAT (Université Paris Dauphine): Phase transitions in ch
 arged polymer models
DESCRIPTION:Julien POISAT: I will review some old and recent results on the
  topic of charged polymer models. Those are random walk models with disord
 ered interaction at self-intersections\, introduced by Kantor and Kardar i
 n the 90’s. Precise results have been obtained so far for the one-dimens
 ional model in the annealed setting\, showing a phase transition from a co
 llapsed phase (attractive interactions prevailing) to an extended phase (r
 epulsive interactions prevailing). Those results have been then extended t
 o higher dimensions\, in a more qualitative way. I will also mention a var
 iant model with quenched disorder\, for which a freezing transition was co
 njectured by Derrida\, Griffiths and Higgs. Based on joint works with Q. B
 erger\, F. Caravenna\, F. den Hollander and N. Pétrélis.
CATEGORIES:Séminaire,ALEA,Probabilités
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9052@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260615T140000
DTEND;TZID=Europe/Paris:20260615T153000
DTSTAMP:20260327T102452Z
URL:https://www.i2m.univ-amu.fr/evenements/seminaire-de-cecile-durot/
SUMMARY:Cécile Durot (Paris Nanterre): Séminaire de Cécile Durot
DESCRIPTION:Cécile Durot: Cécile viendra nous parler de ses thématiques 
 de travail
CATEGORIES:Séminaire,Statistique
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9098@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260612T160000
DTEND;TZID=Europe/Paris:20260612T170000
DTSTAMP:20260603T210946Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-305/
SUMMARY:Fabrizio Andreatta (Università Statale di Milano): Modular forms a
 nd special values of L-functions
DESCRIPTION:Fabrizio Andreatta: In this talk I will present through example
 s the rich interplay between the theory of modular forms (complex analytic
 \, algebaric\, p-adic) and special values of L-functions (analytic and  p
 -adic) starting from  results of Siegel and Serre on Bernoulli numbers us
 ing Eisenstein series.
CATEGORIES:Colloquium
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:8821@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260612T110000
DTEND;TZID=Europe/Paris:20260612T120000
DTSTAMP:20250915T115244Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-2025-09-12-2025-09-19-2025-
 09-26-2025-10-03-2025-10-10-2025-10-17-2025-10-24-2025-10-31-2025-11-07-20
 25-11-14-2025-11-21-2025-11-28-2025-12-05-2025-12-12-2025-12-19-2025-12-26
 -2026-0-05-2026-06-12/
SUMMARY: (...): TBA
DESCRIPTION:: 
CATEGORIES:Séminaire,Rauzy
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9105@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260612T100000
DTEND;TZID=Europe/Paris:20260612T123000
DTSTAMP:20260526T141501Z
URL:https://www.i2m.univ-amu.fr/evenements/complexite-et-minimalite-pour-l
 es-substitutions-et-les-mots-lisses/
SUMMARY:Raphaël Henry (I2M): Complexité et minimalité pour les substitut
 ions et les mots lisses
DESCRIPTION:Raphaël Henry: Le jury sera composé de :\n\n 	Irène Marcovic
 i (rapportrice) - Univ. Rouen Normandie\n 	Reem Yassawi (rapportrice) - Qu
 een Mary Univ. of London\n 	Fabien Durand (président du jury) - Univ. Pic
 adrie Jules Verne\n 	Emmanuel Jeandel (examinateur) - Univ. de Lorraine\n 
 	Julien Leroy (examinateur) - Univ. de Liège\n 	Michaël Rao (examinateur
 ) - ENS de Lyon\n 	Nicolas Bédaride (directeur de thèse) - Aix Marseille
  Univ.\n 	Étienne Moutot (co-directeur de thèse) - Univ. Grenoble Alpes\
 n\nRésumé :\n\nLa dynamique symbolique et la combinatoire des mots sont 
 deux approches complémentaires pour évaluer la complexité des mots infi
 nis\, ces derniers étant souvent des versions discrètes de processus plu
 s complexes. Cette thèse explore deux notions centrales pour décrire les
  mots infinis : la complexité des facteurs est la fonction qui compte les
  mots finis de chaque longueur\, et la récurrence uniforme/minimalité es
 t une propriété qui contrôle la répartition des occurrences de chaque 
 facteur.\nLes substitutions sont une des principales manières de génére
 r des mots infinis et ont donné naissance à une théorie prolifique qui 
 est au cœur de la dynamique symbolique. En nous intéressant d’abord au
  problème du calcul de la complexité d’une suite morphique donnée\, n
 ous présentons une revue des résultats de Pansiot et de Devyatov qui dé
 crivent les classes de complexité possibles. Ensuite\, en nous fondant su
 r la caractérisation des sous-shifts substitutifs minimaux donnée récem
 ment par Shimomura\, nous étudions à quel point un sous-shift peut être
  non-minimal. Pour cela nous caractérisons et comptons les composantes mi
 nimales de ces sous-shifts.\nAu-delà du cadre substitutif\, la suite de O
 ldenburger-Kolakoski pose des questions notoirement difficiles à propos d
 e sa récurrence\, de sa complexité et de ses fréquences. En considéran
 t la généralisation que sont les suites lisses sur des alphabets de deux
  entiers\, nous présentons nos contributions à deux problèmes sur ce su
 jet. En premier nous étudions la complexité du langage des mots lisses\,
  dont la conjecture est qu’elle croît comme Θ(n^ρ) où ρ dépend de 
 l’alphabet. Nous prouvons la borne inférieure dans le cas général et 
 la borne supérieure quand les deux lettres sont des entiers pairs\, et no
 us améliorons la borne supérieure quand les deux lettres sont des entier
 s impairs. En second nous étudions les suites lisses sur les alphabets pa
 irs et impairs\, qui ont l’avantage d’avoir une représentation S-adiq
 ue. Nous prouvons que ces suites sont uniformément récurrents\, et\, ave
 c des conditions sur l’alphabet\, qu’ils ont une complexité linéaire
  et sont uniquement ergodiques.\n\nMots clés : Dynamique symbolique\, com
 binatoire des mots\, complexité des facteurs\, minimalité\, substitutio
 ns\, mots lisses\nAbstract:\n\nSymbolic dynamics and combinatorics on word
 s are two complementary approaches to evaluate how complex infinite words 
 are\, where infinite words are often seen as discrete representations of m
 ore complex processes. This thesis explores two major notions to describe 
 infinite words: the factor complexity is the function that counts the num
 ber of finite words of each length\, and uniform recurrence/minimality is 
 the property that controls how occurrences of finite words are spread.\nSu
 bstitutions are one of the primary ways to generate infinite words and gav
 e birth to a fruitful theory in symbolic dynamics. Driven by the problem o
 f computing the complexity class of a given morphic sequence\, we begin by
  presenting a review of the results of Pansiot and Devyatov that describe 
 the possible complexity classes. Then\, inspired by the recent characteriz
 ation of minimal substitution subshifts by Shimomura\, we investigate how 
 non-minimal a substitution subshift can be. To do so we characterize and c
 ount the minimal components of these subshifts.\nBeyond the substitutive f
 ramework\, the famous Oldenburger-Kolakoski sequence raises difficult que
 stions about its recurrence\, its factor complexity and its frequencies. B
 y considering a generalization called smooth sequences over 2-integer alph
 abets\, we present contributions to two connected problems. We first st
 udy the factor complexity of the language of smooth words\, which is co
 njectured to grow like Θ(n^ρ) where ρ depends on the alphabet. We prove
  the lower bound in the general case and the upper bound when the two let
 ters are even integers\, and we improve the known upper bound when the two
  letters are odd integers. Then we study smooth sequences over even and o
 dd alphabets\, which happen to have an S-adic representation. We prove tha
 t these sequences are uniformly recurrent\, and\, under conditions on the
  alphabet\, that they have linear factor complexity and are uniquely ergod
 ic.\n\nKeywords: Symbolic dynamics\, combinatorics on words\, factor compl
 exity\, minimality\, substitutions\, smooth word
CATEGORIES:Soutenance de thèse,GDAC
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9137@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260611T170000
DTEND;TZID=Europe/Paris:20260611T174500
DTSTAMP:20260625T180908Z
URL:https://www.i2m.univ-amu.fr/evenements/coloring-problems/
SUMMARY:Jérémy Alpacca (I2M): Coloring problems
DESCRIPTION:Jérémy Alpacca: Abstract : Who does not remember coloring as
  a child? It was a chance to let our imagination run free\, guided by a si
 ngle challenge: not to go outside the lines! Today\, we have grown up\, an
 d those days feel like a distant memory.\n\n\n\nIn this talk\, we will att
 empt to revive this childhood pastime from a mathematical perspective. How
 ever\, the goal is quite different. We want to determine the number of dis
 tinct colorings of an object made up of identical regions. At first glance
 \, this may seem like a purely combinatorial problem. Now\, if we color th
 e object and then manipulate it without altering its structure\, we still 
 obtain the same coloring. Group actions then become an essential tool for 
 counting these colorings. Concrete geometric examples will be explored to 
 highlight the connection with abstract algebra and to develop an intuitive
  understanding of the underlying concepts.\n\n
CATEGORIES:Séminaire,Rencontres doctorant⋅es I2M-CPT
LOCATION:I2M Luminy - TPR2\, Salle de Séminaire 304-306 (3ème étage)\, 1
 63 Avenue de Luminy\, Marseille\, 13009\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, Mars
 eille\, 13009\, France;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - TPR2\, Sall
 e de Séminaire 304-306 (3ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:8974@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260611T110000
DTEND;TZID=Europe/Paris:20260611T120000
DTSTAMP:20260306T130053Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-286/
SUMMARY:Ivan Rasskin (LIS (AMU)): TBA
DESCRIPTION:Ivan Rasskin: TBA
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9107@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260609T143000
DTEND;TZID=Europe/Paris:20260609T153000
DTSTAMP:20260605T150858Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-296/
SUMMARY:Pete CZUPPON (AMU): Stochastic models of transposable element dynam
 ics in genomes
DESCRIPTION:Pete CZUPPON: 
CATEGORIES:Séminaire,ALEA,Probabilités
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9104@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260609T110000
DTEND;TZID=Europe/Paris:20260609T120000
DTSTAMP:20260526T111754Z
URL:https://www.i2m.univ-amu.fr/evenements/seminaire-aa-tba-19/
SUMMARY:Yihong Du (University of New England): Séminaire AA -- TBA
DESCRIPTION:Yihong Du: 
CATEGORIES:Séminaire,Analyse Appliquée
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9071@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260608T140000
DTEND;TZID=Europe/Paris:20260608T153000
DTSTAMP:20260605T075219Z
URL:https://www.i2m.univ-amu.fr/evenements/seminaire-de-pierre-vandekerkho
 ve/
SUMMARY:Pierre Vandekerkhove (LAMA\, Université Gustave Eiffel): Séminair
 e de Pierre Vandekerkhove
DESCRIPTION:Pierre Vandekerkhove: Pierre nous parlera du traail "Gold stand
 ard process Markovian poisoning: a semiparametric approach" don't un résu
 mé peut être :\n\nWe consider in this paper a stochastic process that mi
 xes in time\, according to a nonobserved stationary Markov selection proce
 ss\, two separate sources of randomness: i) a stationary process which dis
 tribution is accessible (gold standard)\; ii) a pure i.i.d. sequence which
  distribution is unknown (poisoning process). In this framework we propose
  to estimate\, with two different approaches\, the transition of the hidde
 n Markov selection process along with the distribution\, not supposed to b
 elong to any parametric family\, of the unknown i.i.d. sequence\, under mi
 nimal (identifiability\, stationarity and dependence in time) conditions. 
 We show that both estimators provide consistent estimations of the Euclide
 an transition parameter\, and also prove that one of them\, which is sqrt(
 n)-consistent\, allows to establish a functional central limit theorem abo
 ut the unknown poisoning sequence cumulative distribution function. The nu
 merical performances of our estimators are illustrated through various cha
 llenging examples.
CATEGORIES:Séminaire,Statistique
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:8820@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260605T110000
DTEND;TZID=Europe/Paris:20260605T120000
DTSTAMP:20260601T204144Z
URL:https://www.i2m.univ-amu.fr/evenements/rauzy-2026-06-05/
SUMMARY:Serge TROUBETZKOY (Institut mathématiques de Marseille): Can irreg
 ularity produce entropy
DESCRIPTION:Serge TROUBETZKOY: How much dynamical complexity is forced by g
 eometric irregularity? Recent work shows that many familiar forms of irreg
 ular behavior coexist with zero entropy. I will discuss a new result showi
 ng that this phenomenon breaks down for Besicovitch maps\, continuous func
 tions whose graphs admit no tangent lines.
CATEGORIES:Séminaire,Rauzy
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:8973@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260604T110000
DTEND;TZID=Europe/Paris:20260604T120000
DTSTAMP:20260528T125925Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-285/
SUMMARY:Kemo Morvan (Paris): Singularities admitting contracting automorphi
 sms.
DESCRIPTION:Kemo Morvan: In this talk\, we are interested in the group Aut(
 X\,0) of automorphisms of the germ (X\,0) of a complex analytic space. We 
 show that Aut(X\,0) contains a contracting automorphism if and only if the
  singularity (X\,0) is quasi-homogeneous. This extends previous results by
  Favre and Ruggiero for the normal surface case\, as well as the recent re
 sults by Ornea and Verbitsky for the isolated singularity case. Our proof 
 relies on embeddings and normal forms techniques.
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9087@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260602T143000
DTEND;TZID=Europe/Paris:20260602T153000
DTSTAMP:20260507T151335Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-299/
SUMMARY:Félix ROUVEYRE (Aix-Marseille Université): On characteristic leng
 th for Activated random walk on the line.
DESCRIPTION:Félix ROUVEYRE: The concept of self-organized criticality was 
 introduced by Bak\, Tang and Wiesenfeld to provide a framework for underst
 anding the emergence\, in various contexts\, of systems exhibiting long-ra
 nge correlations. The historical model they proposed was the abelian sandp
 ile. However\, it  suffers some lack of universality. It was a motivation
  for the introduction of the Activated random walk model which is robust\,
  and exhibits a phase transition governed by two parameters.\nDespite many
  progresses in recent years\, many questions remain opened on this model. 
 Among them\, the understanding of correlations functions is a crucial one.
  We make a step in this direction by establishing the existence of a chara
 cteristic length for the one dimensional version of the dynamic at a suffi
 ciently low density. This is a joint work with Grégory Maillard and Alexa
 ndre Gaudillière. 
CATEGORIES:Séminaire,ALEA,Probabilités
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9106@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260602T140000
DTEND;TZID=Europe/Paris:20260602T150000
DTSTAMP:20260531T095252Z
URL:https://www.i2m.univ-amu.fr/evenements/an-homological-analogue-of-the-
 baum-connes-conjecture-with-coefficients-for-lie-groups/
SUMMARY:Axel Gastaldi (I2M): An homological analogue of the Baum-Connes con
 jecture with coefficients for Lie groups
DESCRIPTION:Axel Gastaldi: The Baum-Connes conjecture for Lie groups establ
 ishes a link between the tempered dual of a real Lie group and the unitary
  dual of its maximal compact subgroup. This conjecture has been proved in 
 three different ways: via representation-theoretic arguments\, using the 
 Dirac-dual Dirac method and more recently via Mackey analogy. Conversely\,
  the Baum-Connes conjecture for Lie groups with coefficients still remai
 ns unproven.\nIn this talk we propose an homological analogue of this conj
 ecture with coefficients by comparing the periodic cyclic homology of sm
 ooth crossed product algebras. Our proof relies mostly on the adaptation 
 of the Dirac-dual Dirac method to the Fréchet framework.
CATEGORIES:Séminaire,AGLR,Représentations des Groupes Réductifs
LOCATION:I2M Luminy - TPR2\, Salle de Séminaire 304-306 (3ème étage)\, 1
 63 Avenue de Luminy\, Marseille\, 13009\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, Mars
 eille\, 13009\, France;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - TPR2\, Sall
 e de Séminaire 304-306 (3ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9103@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260602T110000
DTEND;TZID=Europe/Paris:20260602T120000
DTSTAMP:20260526T111525Z
URL:https://www.i2m.univ-amu.fr/evenements/seminaire-aa-sur-quelques-probl
 emes-devolution-non-locaux/
SUMMARY:Anoumou Attiogbé (Univ. Gamal Abdel Nasser de Conakry (Guinée)): 
 Séminaire AA -- Sur quelques problèmes d'évolution non locaux
DESCRIPTION:Anoumou Attiogbé: 
CATEGORIES:Séminaire,Analyse Appliquée
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9097@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260529T160000
DTEND;TZID=Europe/Paris:20260529T170000
DTSTAMP:20260603T211219Z
URL:https://www.i2m.univ-amu.fr/evenements/ai4crypto-training-small-ai-mod
 els-to-solve-hard-math-problems/
SUMMARY:Kristin Lauter (Meta): AI4Crypto: training small AI models to solve
  hard math problems
DESCRIPTION:Kristin Lauter: AI is taking off and we could say we are living
  in “the AI Era”.  Progress in AI today is based on mathematics and s
 tatistics tools to train machine learning models on large amounts of data\
 , to accomplish various prediction tasks like classification.  \nThis ta
 lk will explain five years of work on AI4Crypto\, where we train AI models
  to attack Post Quantum Cryptography (PQC) schemes based on lattices.  Th
 is work is a case study in training small ML models to solve hard math pro
 blems in practice.  Our AI4Crypto project has developed AI models capable
  of recovering secrets in post-quantum cryptosystems (PQC).  The standard
 ized PQC systems were designed to be secure against a quantum computer\, b
 ut are not necessarily safe against advanced AI!  Understanding the conc
 rete security of these standardized PQC schemes is important for the futur
 e of e-commerce and internet security.  So instead of saying that we are 
 living in a “Post-Quantum” era\, we should say that we are living in a
  “Post-AI” era!\n\nLien vers les slides de l'exposé.
CATEGORIES:Colloquium
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:8819@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260529T110000
DTEND;TZID=Europe/Paris:20260529T120000
DTSTAMP:20260520T120526Z
URL:https://www.i2m.univ-amu.fr/evenements/rauzy-2026-05-29/
SUMMARY:Matteo TAROCCHI (Université Paris-Saclay\, Laboratoire de mathéma
 tiques d'Orsay): Conjugaison dans les groupes de Röver-Nekrashevych
DESCRIPTION:Matteo TAROCCHI: Röver-Nekrashevych Groups V(G) are groups of 
 almost automorphisms of regular rooted trees\, and thus homeomorphisms of 
 Cantor spaces\, that are generated by a copy of Thompson's group V togethe
 r with some self-similar group G.\nIn this talk\, I will gently introduce 
 these groups and describe techniques to tackle their conjugacy problem (wh
 ich is the decision problem of\, given any two elements of a group\, deter
 mining whether they are conjugate in such group). This is based on a work-
 in-progress project with Julio Aroca\, Jim Belk and Francesco Matucci\, wh
 ere we show that the conjugacy problem for a Röver-Nekrashevych Group V(G
 ) is solvable as soon as G is a finitely generated\, torsion\, contracting
  self-similar group (e.g.\, when G is Grigorchuk group).
CATEGORIES:Séminaire,Rauzy
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:9136@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260528T170000
DTEND;TZID=Europe/Paris:20260528T174500
DTSTAMP:20260625T180710Z
URL:https://www.i2m.univ-amu.fr/evenements/proving-cryptographic-security-
 the-game-based-approach/
SUMMARY:Baptiste Bazin (I2M): Proving Cryptographic Security: The Game-Base
 d Approach
DESCRIPTION:Baptiste Bazin: Abstract : This presentation explores how the 
 security of cryptographic algorithms is formally proven. Historically\, se
 curity relied on the absence of known attacks\, but since the 1980s–90s\
 , the focus shifted to mathematical proofs. The core idea is to show that 
 breaking a scheme's security is at least as hard as solving a well-known h
 ard mathematical problem (e.g.\, integer factorization or discrete logarit
 hm). Today\, the most widely used method is game-based security proof\, wh
 ere security is modeled as a game between an adversary and a challenger. T
 his talk will explain this method and demonstrate how different security g
 uarantees can be established through such games.
CATEGORIES:Séminaire,Rencontres doctorant⋅es I2M-CPT
LOCATION:I2M Luminy - TPR2\, Salle de Séminaire 304-306 (3ème étage)\, 1
 63 Avenue de Luminy\, Marseille\, 13009\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, Mars
 eille\, 13009\, France;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - TPR2\, Sall
 e de Séminaire 304-306 (3ème étage):geo:0,0
END:VEVENT
BEGIN:VEVENT
UID:8972@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20260528T110000
DTEND;TZID=Europe/Paris:20260528T120000
DTSTAMP:20260522T065549Z
URL:https://www.i2m.univ-amu.fr/evenements/tba-284/
SUMMARY:Antoine Ablondi (Montpellier): Déformations affines de cônes divi
 sibles et espaces-temps affines
DESCRIPTION:Antoine Ablondi: Dans ses travaux\, Mess a introduit une corres
 pondance entre les déformations affines de sous-groupes Fuchsiens de SO(2
 \,1) et certains espaces-temps Lorentziens plats. Par la suite\, cette cor
 respondance a été étendue aux réseaux uniformes de SO(n\,1) par Barbot
  et Bonsante. Depuis\, l’étude de ces espaces-temps à l’aide de dual
 ité et de convexité dans l’espace de Minkowski s’est révélée trè
 s efficace. Ces derniers outils ne sont pas propres à l’espace de Minko
 wski\, ils proviennent simplement de la géométrie convexe dans l’espac
 e affine.\n\nIl existe aussi un cadre plus large que les réseaux uniforme
 s de SO(n\,1)\, lié à des structures affines et projectives convexes sur
  des variétés. Il s'agit des sous-groupes de SL(n+1\,R) divisant des cô
 nes convexes\, au sens de Benoist. Je présenterai donc une généralisati
 on naturelle de la correspondance de Mess–Bonsante–Bonsante : entre le
 s déformations affines de groupes divisant des cônes convexes et des "es
 paces-temps affines" (dont j’introduirai la définition). 
CATEGORIES:Séminaire,Géométrie et Topologie de Marseille
LOCATION:I2M Saint-Charles - Salle de séminaire\, Université Aix-Marseill
 e\, Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, Franc
 e
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Université Aix-Marseille\,
  Campus Saint-Charles\, 3 Place Victor Hugo\, Marseille\, 13003\, France;X
 -APPLE-RADIUS=100;X-TITLE=I2M Saint-Charles - Salle de séminaire:geo:0,0
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/Paris
X-LIC-LOCATION:Europe/Paris
BEGIN:DAYLIGHT
DTSTART:20260329T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20261025T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
END:STANDARD
END:VTIMEZONE
END:VCALENDAR