Discrete Morse theory and the consecutive pattern poset

Details Discrete Morse theory and the consecutive pattern poset Discrete Morse theory and the consecutive pattern poset

2011-07-16

arxiv.org/abs/1107.3262v2

Mathematics

Combinatorics

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Scientific paper

We use discrete Morse theory to provide another proof of Bernini, Ferrari, and Steingrimson's formula for the Mobius function of the consecutive pattern poset. In addition, we are able to determine the homotopy type of this poset. Earlier, Bjorner determined the Mobius function and homotopy type of factor order and the results are remarkably similar to those in the pattern case. In his thesis, Willenbring used discrete Morse theory to give an illuminating proof of Bjorner's result. Since our proof parallels Willenbring's, we also consider the relationship between the two posets.

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