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Colloquium by Davide Lofano (Technische Universität Berlin): Hadamard Matrix Torsion

Nov 08, 2021 | 04:00 PM s.t.

After a brief overview about torsion in homology and examples of complexes with small torsion and few vertices we will 
focus our attention 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 Hadamard matrices H(n) and they have linearly many vertices in n. Our explicit series improves a previous construction by Speyer, narrowing the gap to the highest possible asymptotic torsion growth achieved by Newman via a randomized construction.

Time & Location

Nov 08, 2021 | 04:00 PM s.t.

Technische Universität Berlin
Institut für Mathematik
Straße des 17. Juni 136
10623 Berlin
Room MA 041 (Ground Floor)

Freie Universität Berlin
Technische Universität Berlin
Humboldt-Universität zu Berlin
Deutsche Forschungsgemeinschaft (DFG)