BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//wp-events-plugin.com//7.2.3.1//EN
TZID:Europe/Paris
X-WR-TIMEZONE:Europe/Paris
BEGIN:VEVENT
UID:7225@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20181015T104500
DTEND;TZID=Europe/Paris:20181015T114500
DTSTAMP:20241120T203454Z
URL:https://www.i2m.univ-amu.fr/evenements/on-circles-in-the-spectrum-and-
 related-matters/
SUMMARY:Yuri Tomilov (IMPAN\, Warsaw\, Poland): On circles in the spectrum 
 and related matters
DESCRIPTION:Yuri Tomilov: I plan to present several results linking the num
 erical range of a Hilbert space operator to the circle structure of its sp
 ectrum. I'll try to explain how the numerical ranges approach helps to uni
 fy\, extend or supplement several results where the circular structure of 
 the spectrum is crucial\, e.g. Arveson's theorem on almost-wandering vecto
 rs of unitary actions and Hamdan's recent result on supports of Rajchman m
 easures. Moreover\, I'll give several applications of the approach to new 
 operator-theoretical constructions inverse in a sense to classical power d
 ilations. If time permits\, I'll also address the same or similar issues i
 n a more general setting of operator tuples. This is joint work with V. Mu
 ller (Prague). \nhttps://arxiv.org/abs/1607.00040\n\n&nbsp\;\n
ATTACH;FMTTYPE=image/jpeg:https://www.i2m.univ-amu.fr/wp-content/uploads/2
 021/03/Yuriy_Tomilov.jpg
CATEGORIES:Séminaire,Analyse et Géométrie
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/Paris
X-LIC-LOCATION:Europe/Paris
BEGIN:DAYLIGHT
DTSTART:20180325T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
END:DAYLIGHT
END:VTIMEZONE
END:VCALENDAR