G-invariant Persistent Homology

TL;DR

This paper extends classical persistent homology to G-invariant persistent homology, enabling shape comparison under subgroup actions, with formal stability results and potential applications in shape analysis.

Contribution

It formalizes G-invariant persistent homology, proves its stability, and demonstrates its applicability to shape comparison under subgroup invariance.

Findings

Proves stability of G-invariant persistent Betti number functions.

Formalizes the concept of G-invariant persistent homology.

Shows potential for improved shape comparison applications.

Abstract

Classical persistent homology is a powerful mathematical tool for shape comparison. Unfortunately, it is not tailored to study the action of transformation groups that are different from the group Homeo(X) of all self-homeomorphisms of a topological space X. This fact restricts its use in applications. In order to obtain better lower bounds for the natural pseudo-distance d_G associated with a subgroup G of Homeo(X), we need to adapt persistent homology and consider G-invariant persistent homology. Roughly speaking, the main idea consists in defining persistent homology by means of a set of chains that is invariant under the action of G. In this paper we formalize this idea, and prove the stability of the persistent Betti number functions in G-invariant persistent homology with respect to the natural pseudo-distance d_G. We also show how G-invariant persistent homology could be used in applications concerning shape comparison, when the invariance group is a proper subgroup of the group of all self-homeomorphisms of a topological space. In this paper we will assume that the space X is triangulable, in order to guarantee that the persistent Betti number functions are finite without using any tameness assumption.