The cd-index of fans and lattices

Details The cd-index of fans and lattices The cd-index of fans and lattices

2004-10-24

arxiv.org/abs/math/0410513v2

Mathematics

Algebraic Geometry

The difference between lattices and posets clarified. 19 pages

Scientific paper

The number of flags in a complete fan, or more generally in an Eulerian
poset, is encoded in the cd-index. We prove non-negativity of the cd-index for
complete fans, regular CW-spheres and Gorenstein* posets.

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