# Cohen-Macaulay-ness in codimension for simplicial complexes and expansion functor

Document Type: Research Paper

Author

Department of Mathematics, Faculty of Basic Sciences, University of Maragheh, P.O. Box 55181-83111, Maragheh, Iran, and, School of Mathematics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5746, Tehran, Iran.

Abstract

In this paper we show that expansion of a Buchsbaum simplicial complex is $CM_t$, for an optimal integer $tgeq 1$. Also, by imposing extra assumptions on a $CM_t$ simplicial complex, we prove
that it can be obtained from a Buchsbaum complex.

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Main Subjects

### History

• Receive Date: 30 September 2014
• Revise Date: 07 December 2014
• Accept Date: 07 December 2014