High Quality Content by WIKIPEDIA articles! In geometry, Hessenberg varieties, first studied by De Mari, Procesi, and Shayman, are a family of subvarieties of the full flag variety which are defined by a Hessenberg function h and a linear transformation X. The study of Hessenberg varieties was first motivated by questions in numerical analysis in relation to algorithms for computing eigenvalues and eigenspaces of the linear operator X. Later work by Springer, Peterson, Kostant, among others, found connections with combinatorics, representation theory and cohomology.

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