Flag vectors of Eulerian partially ordered sets

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The closed cone of flag vectors of Eulerian partially ordered sets is studied. It is completely determined up through rank seven. Half-Eulerian posets are defined. Certain limit posets of Billera and Hetyei are half-Eulerian; they give rise to extreme rays of the cone for Eulerian posets. A new family of linear inequalities valid for flag vectors of Eulerian posets is given.
31 pages, LaTeX

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Combinatorics, 06A07

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http://salesiana.dossiersoluciones.com/handle/123456789/78861

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/9907144
 http://arxiv.org/abs/math/9907144

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arXiv