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The poset of proper divisibility
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en
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17
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SIAM Journal on Discrete Mathematics, Volume 31, issue 3, pp. 2093-2109
Abstract
We study the partially ordered set P(a1, ... , an) of all multidegrees (b1, ... , bn) of monomials xb1 1 ... xbn n, which properly divide xa1 1 ... xan n . We prove that the order complex Δ(P(a1, ... , an)) of P(a1, ... an) is (nonpure) shellable by showing that the order dual of P(a1, ... , an) is CL-shellable. Along the way, we exhibit the poset P(4, 4) as a new example of a poset with CL-shellable order dual that is not CL-shellable itself. For n = 2, we provide the rank of all homology groups of the order complex δ(P(a1, a2)). Furthermore, we give a succinct formula for the Euler characteristic of δ(P(a1, a2)).
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Bolognini, D, Macchia, A, Ventura, E & Welker, V 2017, 'The poset of proper divisibility', SIAM Journal on Discrete Mathematics, vol. 31, no. 3, pp. 2093-2109. https://doi.org/10.1137/15M1049142