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DESCRIPTION: After a brief overview about torsion in homology and examples 
 of complexes with small torsion and few vertices we will  focus our attenti
 on on a particular series of examples. In particular\, we will construct a 
 series HMT(n) of 2-dimensional simplicial complexes with huge torsion\, |H_
 1(HMT(n))|=|det(H(n))|=n^(n/2)\, where the construction is based on the Had
 amard matrices H(n) and they have linearly many vertices in n. Our explicit
  series improves a previous construction by Speyer\, narrowing the gap to t
 he highest possible asymptotic torsion growth achieved by Newman via a rand
 omized construction. 
DTSTAMP:20211104T170900
DTSTART:20211108T160000
CLASS:PUBLIC
LOCATION:Technische Universität Berlin\n Institut für Mathematik\n Straße d
 es 17. Juni 136\n 10623 Berlin\n Room MA 041 (Ground Floor)
SEQUENCE:0
SUMMARY:Davide Lofano (Technische Universität Berlin): Hadamard Matrix Tors
 ion
UID:107919846@/www.mi.fu-berlin.de
URL:https://www.mi.fu-berlin.de/en/facetsofcomplexity/monday/20211108-C-Lof
 ano.html
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