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The integral cohomology rings of Peterson varieties in type A (2203.02629v2)
Published 5 Mar 2022 in math.AG and math.AT
Abstract: In this paper, we study the ring structure of the integral cohomology of the Peterson variety of type $\text{A}_{n-1}$. We give two kinds of descriptions: (1) we show that it is isomorphic to the $\mathfrak{S}_n$-invariant subring of the integral cohomology ring of the permutohedral variety, (2) we determine the ring structure in terms of ring generators and their relations.