Filtrations induced by continuous functions

Di Fabio, Barbara ; Frosini, Patrizio (2013) Filtrations induced by continuous functions. [Preprint]

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Abstract

In Persistent Homology and Topology, filtrations are usually given by introducing an ordered collection of sets or a continuous function from a topological space to $\R^n$. A natural question arises, whether these approaches are equivalent or not. In this paper we study this problem and prove that, while the answer to the previous question is negative in the general case, the approach by continuous functions is not restrictive with respect to the other, provided that some natural stability and completeness assumptions are made. In particular, we show that every compact and stable $1$-dimensional filtration of a compact metric space is induced by a continuous function. Moreover, we extend the previous result to the case of multidimensional filtrations, requiring that our filtration is also complete. Three examples show that we cannot drop the assumptions about stability and completeness. Consequences of our results on the definition of a distance between filtrations are finally discussed.

Abstract
Document type
Preprint
Creators
CreatorsAffiliationORCID
Di Fabio, Barbara
Frosini, Patrizio
Subjects
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Deposit date
04 Apr 2013 08:32
Last modified
23 Apr 2013 09:03
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