On Ginzburg's Lagrangian construction of representations of GL(n)

Mathematics – Algebraic Geometry

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7 pages, LaTeX2e

Scientific paper

In 1991 V. Ginzburg observed that one can realize irreducible representations of the group $GL(n,C)$ in the cohomology of certain Springer's fibers for the group GL(d) (for all natural d). However, Ginzburg's construction of the action of GL(n) on this cohomology was a bit artificial (he defined the action of Chevalley generators of the Lie algebra gl(n) on the corresponding cohomology by certain explicit correspondences, following the work of A. Beilinson, G. Lusztig and R. MacPherson, who gave a similar construction of the quantum group $U_q(gl(n))$). In this note we give a very simple geometric definition of the action of the whole group GL(n,C) on the above cohomology and simplify the Ginzburg's results.

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