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arxiv: 0906.0273 · v1 · submitted 2009-06-01 · 🧮 math.AC · math.CO

Sequentially Cohen-Macaulay bipartite graphs: vertex decomposability and regularity

classification 🧮 math.AC math.CO
keywords bipartitecohen-macaulayregularitysequentiallyvertexcastelnuovo-mumfordcomplexdecomposability
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Let G be a bipartite graph with edge ideal I(G) whose quotient ring R/I(G) is sequentially Cohen-Macaulay. We prove: (1) the independence complex of G must be vertex decomposable, and (2) the Castelnuovo-Mumford regularity of R/I(G) can be determined from the invariants of G.

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