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Boolean formulae, hypergraphs and combinatorial topology

Authors
  • Conant, James
  • Thistlethwaite, Oliver
Type
Preprint
Publication Date
Aug 23, 2010
Submission Date
Aug 05, 2008
Identifiers
arXiv ID: 0808.0739
Source
arXiv
License
Yellow
External links

Abstract

With a view toward studying the homotopy type of spaces of Boolean formulae, we introduce a simplicial complex, called the theta complex, associated to any hypergraph, which is the Alexander dual of the more well-known independence complex. In particular, the set of satisfiable formulae in k-conjunctive normal form with less than or equal to n variables has the homotopy type of Theta(Cube(n,n-k)), where Cube(n,n-k) is a hypergraph associated to the (n-k)-skeleton of an n-cube. We make partial progress in calculating the homotopy type of theta for these cubical hypergraphs, and we also give calculations and examples for other hypergraphs as well. Indeed studying the theta complex of hypergraphs is an interesting problem in its own right.

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