A "Staircase" formula for the Chern-Schwartz-MacPherson cycle of a matroid

Published 5 Sep 2024 in math.CO and math.AG | (2409.03641v3)

Abstract: We provide a formula for the Poincar\'e dual of the Chern-Schwartz-MacPherson (CSM) cycle of a matroid in the Chow ring of the matroid. We derive the formula from the case of matroids realizable over the complex numbers and prove that it satisfies a contraction-deletion formula. From this fact, we prove it holds for all matroids, confirming a conjecture of Fife and Rinc\'on.

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