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math.CO2012★ 4 cited
Eigenvalues of Hermitian matrices and equivariant cohomology of Grassmannians
David Anderson, Edward Richmond, Alexander Yong
The saturation theorem of [Knutson-Tao '99] concerns the nonvanishing of Littlewood-Richardson coefficients. In combination with work of [Klyachko '98], it implies [Horn '62]'s con…
math.CO2012★ 11 cited
Rationally smooth elements of Coxeter groups and triangle group avoidance
Edward Richmond, William Slofstra
We study a family of infinite-type Coxeter groups defined by the avoidance of certain rank 3 parabolic subgroups. For this family, rationally smooth elements can be detected by loo…