Persistence and Topological Complexity

Abstract

Topological complexity is a homotopy invariant that measures the minimal number of continuous rules required for motion planning in a space. In this work, we introduce persistent analogs of topological complexity and its cohomological lower bound, the zero-divisor-cup-length, for persistent topological spaces, and establish their stability. For Vietoris--Rips filtrations of metric spaces, we show that the erosion distances between these persistent invariants are bounded above by twice the Gromov--Hausdorff distance. We develop metric models of classical topological spaces based on cube boundaries with the ${\ell }_{\infty }$ metric and their products and wedges, allowing explicit computations of persistent invariants and their distances. These examples show that, in certain cases, persistent topological complexity and zero-divisor-cup-length distinguish spaces that persistent homology, persistent LS-category, and persistent cup-length fail to distinguish.

49 pages, 4 figures, 4 tables