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Ideas from Zariski Topology in the Study of Cubical Homology

Published online by Cambridge University Press:  20 November 2018

Tomasz Kaczynski ,
Marian Mrozek  and
Anik Trahan
Tomasz Kaczynski
Affiliation:
Département de Mathématiques, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1 email: [email protected], [email protected]
Marian Mrozek
Affiliation:
Division of Computational Mathematics, Graduate School of Business, ul. Zielona 27, 33-300 Nowy Sącz, Poland, email: [email protected] and Institute of Computer Science, Jagiellonian University, 31-072 Kraków, [email protected]
Anik Trahan
Affiliation:
Département de Mathématiques, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1 email: [email protected], [email protected]
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Abstract

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Cubical sets and their homology have been used in dynamical systems as well as in digital imaging. We take a fresh look at this topic, following Zariski ideas from algebraic geometry. The cubical topology is defined to be a topology in ${{\mathbb{R}}^{d}}$ in which a set is closed if and only if it is cubical. This concept is a convenient frame for describing a variety of important features of cubical sets. Separation axioms which, in general, are not satisfied here, characterize exactly those pairs of points which we want to distinguish. The noetherian property guarantees the correctness of the algorithms. Moreover, maps between cubical sets which are continuous and closed with respect to the cubical topology are precisely those for whom the homology map can be defined and computed without grid subdivisions. A combinatorial version of the Vietoris–Begle theorem is derived. This theorem plays the central role in an algorithm computing homology of maps which are continuous with respect to the Euclidean topology.

Keywords

55–0452B0554C6068W0568W3068U10
Type
Research Article
Information
Canadian Journal of Mathematics , Volume 59 , Issue 5 , 01 October 2007 , pp. 1008 - 1028
Copyright
Copyright © Canadian Mathematical Society 2007

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