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• W2951948066 abstract "We use the correspondence between hypergraphs and their associated edge ideals to study the minimal graded free resolution of squarefree monomial ideals. The theme of this paper is to understand how the combinatorial structure of a hypergraph H appears within the resolution of its edge ideal I(H). We discuss when recursive formulas to compute the graded Betti numbers of I(H) in terms of its sub-hypergraphs can be obtained; these results generalize our previous work on the edge ideals of simple graphs. We introduce a class of hypergraphs, which we call properly-connected, that naturally generalizes simple graphs from the point of view that distances between intersecting edges are ``well behaved''. For such a hypergraph H (and thus, for any simple graph), we give a lower bound for the regularity of I(H) via combinatorial information describing H, and an upper bound for the regularity when H = G is a simple graph. We also introduce triangulated hypergraphs, a properly-connected hypergraph which is a generalization of chordal graphs. When H is a triangulated hypergraph, we explicitly compute the regularity of I(H) and show that the graded Betti numbers of I(H) are independent of the ground field. As a consequence, many known results about the graded Betti numbers of forests can now be extended to chordal graphs." @default.
• W2951948066 created "2019-06-27" @default.
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• W2951948066 date "2006-06-21" @default.
• W2951948066 modified "2023-09-27" @default.
• W2951948066 title "Monomial ideals, edge ideals of hypergraphs, and their graded Betti numbers" @default.
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