KNR TUTORIAL SHEET 3 CASIMIR, COMPLETE REDUCIBILITY, AND PRESERVATION OF JORDAN DECOMPOSITION
Humphreys 6.1, 6.6, 6.7, 6.8, 6.9, 6.4, 6.5. (1) (Complete reducibility for sl2 (C)) Let V be a finite dimensional sl2 (C)module. • Show that the “Casimir element” C = XY + Y X + 12 H 2 belongs to the centre of the universal enveloping algebra of sl2 (C). Thus the generalized eigenspaces of C are sl2 (C)-invariant. • A vector v of V is primitive if it is an eigenvector for H and Xv vanishes modulo a proper invariant subspace W of V . Show that V is generated as an sl2 (C)-module by its primitive vectors. • If v is a primitive vector with weight λ and belongs to the generalized eigenspace of C with eigenvalue µ, then 21 λ2 + λ = µ. • If all the primitive vectors of V have the same weight, then they are all highest weight vectors. • Conclude that all the primitive vectors belonging to a generalized Ceigenspace of V have the same weight and therefore are all highest weight vectors. Thus each such generalized eigenspace is generated by highest weight vectors. But, as we have seen, a finite dimensional module generated by a highest weight vector is semisimple.
vanishes modulo a proper invariant subspace W of V . Show that V is generated as an sl2(C)-module by its primitive vectors. ⢠If v is a primitive vector with weight ...
generated as an sl2(C)-module by its primitive vectors. ⢠If v is a primitive vector with weight λ and belongs to the generalized eigenspace of C with eigenvalue µ, ...
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