activity
20112026
most citedFixed point theorem for reflexive Banach spaces and uniformly convex non positively curved metric spaces

7 citations · 31 across the 23 of their papers we have counts for

collaborators
Showing 2019Show all

2 papers · 1 filter

math.GR2019★ 1 cited

Curvature criterion for vanishing of group cohomology

Zohar Grinbaum-Reizis, Izhar Oppenheim

We introduce a new geometric criterion for vanishing of cohomology for BN-pair groups. In particular, this new criterion yields a sharp vanishing of cohomology result for all BN-pa…

math.CO2019

Coboundary and cosystolic expansion from strong symmetry

Tali Kaufman, Izhar Oppenheim

Coboundary and cosystolic expansion are notions of expansion that generalize the Cheeger constant or edge expansion of a graph to higher dimensions. The classical Cheeger inequalit…