R. Meshulam

activity

20032024

most citedLeray numbers of projections and a topological Helly type theorem

34 citations · 72 across the 23 of their papers we have counts for

collaborators

Showing 2018Show all

4 papers · 1 filter

math.CO2018

On Lusztig-Dupont homology of flag complexes

Roy Meshulam, Shira Zerbib

Let $V$ be an $n$ -dimensional vector space over the finite field of order $q$ . The spherical building $X_{V}$ associated with $G L (V)$ is the order complex of the nontrivial linear su…

math.CO2018★ 3 cited

Graph codes and local systems

Roy Meshulam

It is shown that the good expander codes introduced by Sipser and Spielman, can be realized as the first homology of a graph with respect to a certain twisted coefficient system.

math.CO2018

Quantitative aspects of acyclicity

Dmitry N. Kozlov, Roy Meshulam

We study several aspects of the $k$ -th Cheeger constant of a complex X, a parameter that quantifies the distance of $X$ from a complex $Y$ with nontrivial $k$ -th cohomology over $\…

math.CO2018

Spectral expansion of random sum complexes

Orr Beit-Aharon, Roy Meshulam

Let $G$ be a finite abelian group of order $n$ and let $Δ_{n - 1}$ denote the $(n - 1)$ -simplex on the vertex set $G$ . The sum complex $X_{A, k}$ associated to a subset $A \subset G$ an…