The cd-index of semi-Eulerian posets
Abstract
We generalize the definition of the cd-index of an Eulerian poset to the class of semi-Eulerian posets. For simplicial semi-Eulerian Buchsbaum posets, we show that all coefficients of the cd-index are non-negative. This proves a conjecture of Novik for odd dimensional manifolds and extends it to the even dimensional case.
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