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- W2952079581 abstract "In this manuscript we develop the theory of poset pinball, a combinatorial game recently introduced by Harada and Tymoczko for the study of the equivariant cohomology rings of GKM-compatible subspaces of GKM spaces. Harada and Tymoczko also prove that in certain circumstances, a successful outcome of Betti poset pinball yields a module basis for the equivariant cohomology ring of the GKM-compatible subspace. Our main contributions are twofold. First we construct an algorithm (which we call the dimension pair algorithm) which yields the result of a successful outcome of Betti poset pinball for any type $A$ regular nilpotent Hessenberg and any type $A$ nilpotent Springer variety, considered as GKM-compatible subspaces of the flag variety $Flags(C^n)$. The definition of the algorithm is motivated by a correspondence between Hessenberg affine cells and certain Schubert polynomials which we learned from Erik Insko. Second, in the special case of the type $A$ regular nilpotent Hessenberg varieties specified by the Hessenberg function $h(1)=h(2)=3$ and $h(i) = i+1$ for $3 leq i leq n-1$ and $h(n)=n$, we prove that the pinball result coming from the dimension pair algorithm is poset-upper-triangular; by results of Harada and Tymoczko this implies the corresponding equivariant cohomology classes form a $H^*_{S^1}(pt)$-module basis for the $S^1$-equivariant cohomology ring of the Hessenberg variety." @default.
- W2952079581 created "2019-06-27" @default.
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- W2952079581 date "2010-12-17" @default.
- W2952079581 modified "2023-09-23" @default.
- W2952079581 title "Poset pinball, the dimension pair algorithm, and type A regular nilpotent Hessenberg varieties" @default.
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- W2952079581 doi "https://doi.org/10.48550/arxiv.1012.4054" @default.
- W2952079581 hasPublicationYear "2010" @default.
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