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SUMMARY:Johnny Nicholson (UCL)
DTSTART:20210423T150000Z
DTEND:20210423T161500Z
DTSTAMP:20260423T005714Z
UID:CIRGET/38
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CIRGET/38/">
 Projective modules and exotic group presentations</a>\nby Johnny Nicholson
  (UCL) as part of CRM - Séminaire du CIRGET / Géométrie et Topologie\n\
 n\nAbstract\nTwo presentations for a group G which have the same deficienc
 y are called exotic if the corresponding presentation complexes are not ho
 motopy equivalent. The first examples of exotic presentations were found b
 y Dunwoody and Metzler in the 1970s but\, owing to the difficulty of the a
 lgebra involved\, few other examples have since been found.\nIn this talk\
 , I will discuss a class of finite groups G for which these algebraic diff
 iculties can be largely reduced to a question about projective ZG modules 
 which we resolve. I will also discuss applications to Wall’s D2 problem 
 and the classification of 4-manifolds.\n
LOCATION:https://researchseminars.org/talk/CIRGET/38/
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