Seminario di algebra e geometria
ore
11:00
presso Seminario II
A simplicial complex of dimension d - 1 is said to be Cohen-Macaulay in codimension t, 0 <= t <=d -1, if it is pure and the link of any
face with cardinality at least t is Cohen-Macaulay. This generalizes several concepts on simplicial complexes such as Cohen-Macaualyness, Buchsbaum property, S_r condition of Serre, and locally Cohen-Macaulayness. Most results on the simplicial complexes with aforementioned properties naturally extend to the case of Cohen-Macaulayness in codimension t. In particular,
the Eagon-Reiner theorem, the local behavior, and the homological vanishing properties are suitably retained. Furthermore, characterizations of certain families of Cohen-Macaulay simplicial complexes carry over characterizations
of these families of simplicial complexes which are Cohen-Macaulay in codimension t.
This talk is based on recent joint works with H. Haghighi, S. A. S. Fakhari
and S. Yassemi.
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