Eigenvalues, invariant factors, highest weights, and Schubert calculus

Abstract

We describe recent work of Klyachko, Totaro, Knutson, and Tao, that characterizes eigenvalues of sums of Hermitian matrices, and decomposition of tensor products of representations of $G{L}_n(\mathbb{C})$. We explain related applications to invariant factors of products of matrices, intersections in Grassmann varieties, and singular values of sums and products of arbitrary matrices.

42 pages, AMSTeX, with Xy-pic. This is the final version, including corrections made in page proofs for publication as a Research/Expository article in Bull. Amer. Math. Soc