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UID:1878@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20170915T140000
DTEND;TZID=Europe/Paris:20170915T150000
DTSTAMP:20170831T120000Z
URL:https://www.i2m.univ-amu.fr/evenements/a-characterization-of-pseudo-an
 osov-maps-with-vanishing-sah-arnoux-fathi-invariant/
SUMMARY: (...): A characterization of pseudo-Anosov maps with vanishing Sah
 -Arnoux-Fathi invariant
DESCRIPTION:: We show that an orientable pseudo-Anosov map has vanishing Sa
 h-Arnoux-Fathi (SAF) invariant if and only if the minimal polynomial of it
 s dilation is not a reciprocal polynomial.   The proof relies on results o
 f Arnoux\,  Kenyon-Smillie\, and Calta-Smillie.     We also show that ever
 y bi-Perron unit is the leading eigenvalue of the action on first integral
  homology induced by some pseudo-Anosov map.  The proof is an application 
 of a construction of Margalit-Spallone. The talk will concentrate on the f
 irst result.This is joint work with my student\,  Hieu Trung Do.http://mat
 h.oregonstate.edu/people/view/toms
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DTSTART:20170326T030000
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