The Existence of Pure Free Resolutions

By David Eisenbud, Gunnar Fløystad, Jerzy Weyman. 2007

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Let d1,...,dn be a strictly increasing sequence of integers. Boij and S\"oderberg [arXiv:math/0611081] have conjectured the existence of a graded module M of finite length over any polynomial ring K[x_1,..., x_n], whose minimal free resolution is pure of type (d1,...,dn), in the sense that its i-th syzygies are generated in degree di. In this paper we prove a stronger statement, in characteristic zero: Such modules not only exist, but can be taken to be GL(n)-equivariant. In fact, we give two different equivariant constructions, and we construct pure resolutions over exterior algebras and Z/2-graded algebras as well. The constructions use the combinatorics of Schur functors and Bott's Theorem on the direct images of equivariant vector bundles on Grassmann varieties.

Subfields: Geometry and Topology, Statistics and Probability

View Paper: https://www.semanticscholar.org/paper/43ef9985547cd2da7d9d1864c47b69fda0e7cc79

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In Geometry and Topology

  1. M. Boij
  2. Jonas Söderberg
  3. Steven V. Sam
  4. Andrew Snowden
  5. David Eisenbud
  6. Frank-Olaf Schreyer
  7. Gunnar Fløystad

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