Rigid monomial ideals

Timothy B. P. Clark; Sonja Mapes

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arXiv · 1102.2243

Rigid monomial ideals

Timothy B. P. Clark·Sonja Mapes

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Abstract

In this paper we investigate the class of rigid monomial ideals. We give a characterization of the minimal free resolutions of certain classes of these ideals. Specifically, we show that the ideals in a particular subclass of rigid monomial ideals are lattice-linear and thus their minimal resolution can be constructed as a poset resolution. We then use this result to give a description of the minimal free resolution of a larger class of rigid monomial ideals by using $\mathcal{L}(n)$, the lattice of all lcm-lattices of monomial ideals with $n$ generators. By fixing a stratum in $\mathcal{L}(n)$ where all ideals have the same total Betti numbers we show that rigidity is a property which is upward closed in $\mathcal{L}(n)$. Furthermore, the minimal resolution of all rigid ideals contained in a fixed stratum is shown to be isomorphic to the constructed minimal resolution.

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BibTeX RIS

Timothy B. P. Clark, Sonja Mapes. 2011-02-10. Rigid monomial ideals. https://arxiv.org/abs/1102.2243

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