Algebraic and Analytic Methods in Representation Theory by Bent Orsted

By Bent Orsted

This publication is a compilation of numerous works from well-recognized figures within the box of illustration concept. The presentation of the subject is exclusive in supplying numerous assorted issues of view, which should still makethe e-book very priceless to scholars and specialists alike. provides numerous various issues of view on key issues in illustration thought, from across the world recognized specialists within the box

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The answer is that this dependence is essentially a polynomial one; that is, there is a finite set of polynomials the values of which determine these Goldie ranks. Moreover, for each X(O) it is appropriate to select a subset of these polynomials.

B' = woBwo, where w0 is (a representative in G of) the longest element in W. Set 2 ' - I n d ~ T T. Then, clearly, Z~ has properties completely analogous to Z~. 2) for all A E X(T). We now have Let A,# E X(T). Then k, i f # - A + 2 ( p r - 1 ) p , i) Homa~T(2'~(A),2~(tt)) ~ O, otherwise. 6 ii) Ext~T(2'~(A), 2~(#)) -- 0. 5 noticing that the (contravariant) dual of Z~(A) is isomorphic to Zr(A + 2 ( / - 1)p). This also implies (i) via Frobenius reciprocity and some easy weight considerations. 6, it follows that [M" 2 ~ ( , ) ] - dimHomG~T(Z'r(#- 2 ( / - 1)p), M) for any G~T-module M that has a Z~-filtration.

Proof: The projection V~ --~ k onto the basis element y n E Vn is a B- homomorphism if we let B act on k via )in. 10), we get a G-homomorphism ¢'Vn ~ H°()in). One checks that this is an isomorphism. 2 Let n >_ O. Then H°()in) has a basis { v 0 , . . , v ~ } such that, for all i - 0 , . . , n , i) tvi -- )i2i_~(t)vi, ii) (10 u) 1 ~ ( im)U'--'~Vm, " Vi -- Em=O Proof: Set v i - Remark t C T. u e k. 2). D It is easy from this corollary to check that in characteristic zero the H°()in) are all irreducible.

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