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On the 2-modular reduction of the Steinberg representation of the symplectic group

Fernando Szechtman

math.RTarXiv:math/0212378

Abstract

We show that in characteristic 2, the Steinberg representation of the symplectic group Sp(2n,q), q a power of an odd prime p, has two irreducible constituents lying just above the socle that are isomorphic to the two Weil modules of degree (qn-1)/2.

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