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arXiv · 2404.16643

Subadditivity of shifts, Eilenberg-Zilber shuffle products and homology of lattices

Karim Adiprasito·Anders Björner·Joel Hakavuori·Minas Margaritis·Volkmar Welker
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Abstract

We show that the maximal shifts in the minimal free resolution of the quotients of a polynomial ring by a monomial ideal are subadditive as a function of the homological degree. This answers a question that has received some attention in recent years. To do so, we define and study a new model for the homology of posets, given by the so called synor complex. We also introduce an Eilenberg-Zilber type shuffle product on the simplicial chain complex of lattices. Combining these concepts we prove that the existence of a nonzero homology class for a lattice forces certain nonzero homology classes in lower intervals. This result then translates into properties of the minimal free resolution. In particular, it yields a strengthening of the original subadditivity statement.

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Karim Adiprasito, Anders Björner, Joel Hakavuori, Minas Margaritis, Volkmar Welker. 2024-04-25. Subadditivity of shifts, Eilenberg-Zilber shuffle products and homology of lattices. https://arxiv.org/abs/2404.16643

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