Higher Cohen-Macaulay property of squarefree modules and simplicial posets.

link: http://arxiv.org/abs/1001.3601
Abstract

Recently, G. Floystad studied "higher Cohen-Macaulay property" of certain
finite regular cell complexes. In this paper, we partially extend his results
to squarefree modules, toric face rings, and simplicial posets. For example, we
show that if (the corresponding cell complex of) a simplicial poset is
$l$-Cohen-Macaulay then its codimension one skeleton is $(l+1)$-Cohen-Macaulay.