# Invariance properties of the Multidimensional matching distance in Persistent Topology and Homology

Andrea, Cerri ; Patrizio, Frosini (2010) Invariance properties of the Multidimensional matching distance in Persistent Topology and Homology. DOI 10.6092/unibo/amsacta/2765.
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## Abstract

Persistent Topology studies topological features of shapes by analyzing the lower level sets of suitable functions, called filtering functions, and encoding the arising information in a parameterized version of the Betti numbers, i.e. the ranks of persistent homology groups. Initially introduced by considering real-valued filtering functions, Persistent Topology has been subsequently generalized to a multidimensional setting, i.e. to the case of $\R^n$-valued filtering functions, leading to studying the ranks of multidimensional homology groups. In particular, a multidimensional matching distance has been defined, in order to compare these ranks. The definition of the multidimensional matching distance is based on foliating the domain of the ranks of multidimensional homology groups by a collection of half-planes, and hence it formally depends on a subset of $\R^n\times\R^n$ inducing a parameterization of these half-planes. It happens that it is possible to choose this subset in an infinite number of different ways. In this paper we show that the multidimensional matching distance is actually invariant with respect to such a choice.

Abstract
Document type
Monograph (Technical Report)
Creators
CreatorsAffiliationORCID
Andrea, Cerri
Patrizio, Frosini
Keywords
Multidimensional rank invariant, Size Theory, Topological Persistence
Subjects
DOI
Deposit date
27 Apr 2010 12:17