Minimal Betti Numbers

Details Minimal Betti Numbers Minimal Betti Numbers

2006-04-22

arxiv.org/abs/math/0604479v2

Mathematics

Commutative Algebra

Scientific paper

We give conditions for determining the extremal behavior for the (graded) Betti numbers of squarefree monomial ideals. For the case of non-unique minima, we give several conditions which we use to produce infinite families, exponentially growing with dimension, of Hilbert functions which have no smallest (graded) Betti numbers among squarefree monomial ideals and all ideals. For the case of unique minima, we give two families of Hilbert functions, one with exponential and one with linear growth as dimension grows, that have unique minimal Betti numbers among squarefree monomial ideals.

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