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Topology and Computing

Computing Session Talk #4.1

Subevent of Computing Session #4

HUMB 142

Times: 2025 Aug 13 from 08:30AM to 08:55AM (Central Time (US & Canada))

Webinar link: Icon: video Webinar

Facets in the Vietoris--Rips complexes of hypercubes

Ziqin Feng ⟨zzf0006@auburn.edu⟩

Abstract:

In this talk, we’ll discuss the facets (maximal simplices) of the Vietoris–Rips complex $\mathrm{VR}(Q_n; r)$ where $Q_n$ denotes the $n$-dimensional hypercube. We are particularly interested in those facets which are somehow independent of the dimension $n$. Using Hadamard matrices, we prove that the number of different dimensions of such facets is a super-polynomial function of the scale $r$, assuming that $n$ is sufficiently large. We show also that the $(2r-1)$-th dimensional homology of the complex $\mathrm{VR}(Q_n; r)$ is non-trivial when $n$ is large enough, provided that the Hadamard matrix of order $2r$ exists.

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