AKCE International Journal of Graphs and Combinatorics (Sep 2020)
An algorithm for an 𝓁2-homological test for the planarity of a graph
Abstract
Given a finite simple graph Γ, one is able to define the presentation of an associate Coxeter group and construct a CW-complex on which the associated Coxeter group acts. The space is the so-called Davis Complex, denoted and the given graph carries much of the local topological information of the space. This paper summarizes these connections including those between the -homology of and the planarity (or genus) of Γ. The main purpose of this paper is to further investigate this interesting connection between a main topic in geometric group theory (discrete group actions on cellular complexes) and the detection of planar graphs by creating an algorithm we call the -test.
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