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Recently, Herzog and Hibi explicitly described all Cohen-Macaulay bipartite graphs by using the Stanley-Reisner ideal of the Alexander dual of the simplicial complex Δ P associated to a finite poset P. In this paper, we will present a short proof that does not use the Stanley-Reisner ideal of the Alexander dual of Δ P .
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg – Springer Journals
Published: Dec 11, 2009
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