BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Homotopy equivalence and simple homotopy equivalence of manifolds 
 [MPIM]
DTSTART:20260129T140000Z
DTEND:20260129T150000Z
DTSTAMP:20260420T164300Z
UID:indico-event-1074@math-events.uni-bonn.de
DESCRIPTION:Speakers: Csaba Nagy (MPIM)\n\nMPI-Oberseminar\nA homotopy equ
 ivalence between finite CW-complexes is called simple if it is homotopic t
 o a composition of elementary collapses and expansions. Lens spaces provid
 e famous examples of manifolds that are homotopy equivalent but not simple
  homotopy equivalent to each other\, in all ≥3≥3 odd dimensions. Howev
 er\, no even-dimensional examples are known in the literature. \nWe constr
 uct even-dimensional manifolds that are homotopy equivalent (in fact h-cob
 ordant) but not simple homotopy equivalent to each other. More generally\,
  we give a purely algebraic characterisation of groups G with the property
  that there exists a pair of manifolds with fundamental group G that are h
 -cobordant but not simple homotopy equivalent. \nThis is joint work with J
 ohnny Nicholson and Mark Powell.\n\nhttps://math-events.uni-bonn.de/event/
 1074/
LOCATION:MPIM\, Vivatsgasse\,  7 - Lecture Hall (Max Planck Institute for 
 Mathematics)
URL:https://math-events.uni-bonn.de/event/1074/
END:VEVENT
END:VCALENDAR