Mathematics – Algebraic Topology
Scientific paper
2010-05-29
Mathematics
Algebraic Topology
21 pages, 4 figures
Scientific paper
Precubical sets, i.e., cubical sets without degeneracies, can be used to model systems of concurrently executing processes. From the point of view of concurrency theory, two precubical sets can be considered equivalent if their geometric realizations have the same directed homotopy type relative to the extremal elements in the sense of P. Bubenik. We give conditions under which it is possible to collapse an edge or to eliminate a cube and a free face in a 2-dimensional precubical set to obtain an equivalent smaller one. We use our results to construct small models of some simple precubical sets.
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