On a conjecture about enumerating $(2+2)$-free posets

Details On a conjecture about enumerating $(2+2)$-free posets On a conjecture about enumerating $(2+2)$-free posets

2010-06-07

arxiv.org/abs/1006.1226v3

Mathematics

Combinatorics

Scientific paper

Recently, Kitaev and Remmel posed a conjecture concerning the generating
function for the number of unlabeled $(2+2)$-free posets with respect to number
of elements and number of minimal elements. In this paper, we present a
combinatorial proof of this conjecture.

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