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Shellability of chessboard complexes

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Abstract

The matchings in a complete bipartite graph form a simplicial complex, which in many cases has strong structural properties. We use an equivalent description aschessboard complexes: the complexes of all nontaking rook positions on chessboards of various shapes.

In this paper we construct ‘certificatek-shapes’ Σ(m, n, k) such that if the shapeA contains some Σ(m, n, k), then the (k−1)-skeleton of the chess-board complexδ(A) isvertex decomposable in the sense of Provan & Billera. This covers, in particular, the case of rectangular chessboardsA=[m]×[n], for which Δ(A) is vertex decomposable ifn≥2m−1, and the\(([\frac{{m + n + 1}}{3}] - 1)\)-skeleton is vertex decomposable in general.

The notion of vertex decomposability is a very convenient tool to prove shellability of such combinatorially defined simplicial complexes. We establish a relation between vertex decomposability and the CL-shellability technique (for posets) of Björner & Wachs.

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Ziegler, G.M. Shellability of chessboard complexes. Israel J. Math. 87, 97–110 (1994). https://doi.org/10.1007/BF02772986

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  • DOI: https://doi.org/10.1007/BF02772986

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