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arxiv: 1402.2469 · v1 · pith:4GUVCTBRnew · submitted 2014-02-11 · 🧮 math.CO · math.AC

The edge ideals of complete multipartite hypergraphs

classification 🧮 math.CO math.AC
keywords completeconditioncohen-macaulayhypergraphhypergraphsmultipartitepropertiessequentially
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We classify all complete uniform multipartite hypergraphs with respect to some algebraic properties, such as being (almost) complete intersection, Gorenstein, level, $l$-Cohen-Macaulay, $l$-Buchsbaum, unmixed, and satisfying Serre's condition $S_r$, via some combinatorial terms. Also, we prove that for a complete $s$-uniform $t$-partite hypergraph $H$, vertex decomposability, shellability, sequentially $S_r$ and sequentially Cohen-Macaulay properties coincide with the condition that $H$ has $t-1$ sides consisting of a single vertex. Moreover, we show that the latter condition occurs if and only if it is a chordal hypergraph.

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