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The cd-index of fans and posets

  • Kalle Karu (a1)
  • DOI: http://dx.doi.org/10.1112/S0010437X06001928
  • Published online: 17 May 2006
Abstract

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

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Compositio Mathematica
  • ISSN: 0010-437X
  • EISSN: 1570-5846
  • URL: /core/journals/compositio-mathematica
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