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math.CO2000
Syzygies of Oriented Matroids
I. Novik, A. Postnikov, B. Sturmfels
We construct minimal cellular resolutions of squarefree monomial ideals arising from hyperplane arrangements, matroids and oriented matroids. These are Stanley-Reisner ideals of co…
math.CO2000
Symmetries of Gromov-Witten invariants
Alexander Postnikov
The group (Z/nZ)^2 is shown to act on the Gromov-Witten invariants of the complex flag manifold. We also deduce several corollaries of this result.