Download Affine Hecke Algebras and Orthogonal Polynomials by I. G. Macdonald PDF

By I. G. Macdonald

ISBN-10: 0521824729

ISBN-13: 9780521824729

A passable and coherent conception of orthogonal polynomials in different variables, connected to root structures, and counting on or extra parameters, has built lately. This finished account of the topic offers a unified starting place for the speculation to which I.G. Macdonald has been a vital contributor. the 1st 4 chapters lead as much as bankruptcy five which incorporates the entire major effects.

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Extra resources for Affine Hecke Algebras and Orthogonal Polynomials

Example text

Hence for some i = 0 we have ri ≥ 1 and <ν , αi > ≥ 1. Since <µ , αi > ≥ 0 it follows that <λ , αi > ≥ 1 and hence that λ1 = λ − αi∨ ∈ X . Consequently µ = λ1 − ν1 , where ν1 = ν − αi∨ ∈ Q + and r (ν1 ) = r − 1. By the inductive hypothesis it follows that µ ∈ X . Let λ ∈ L ++ and let (λ ) denote the smallest saturated subset of L that contains λ . Let C(λ ) denote the convex hull in V of the orbit W0 λ , and let 1 (λ ) = C(λ ) ∩ (λ + Q ∨ ), 2 (λ )= w∈W0 w(λ − Q ∨+ ). 2) (λ ) = 1 (λ )= 2 (λ ). Proof (a) (λ ) ⊂ 1 (λ ).

4 ) W = W (R , L) = W0 t(L) and everything in this chapter relating to W applies equally to W . Each w ∈ W is of the form w = vt(λ ), where λ ∈ L and v ∈ W0 . 5) vt(λ )(a) = v(a) − <λ , α>c which lies in S because <λ , α> ∈ Z. It follows that W permutes S. For each i ∈ I, i = 0, let = {<λ , αi > : λ ∈ L }, a subgroup of Z. Since αi∨ ∈ L it follows that 2 ∈ , and hence that = Z or 2Z. 4)). In all other cases, = Z. 1) S(w) = S + ∩ w −1 S − so that a ∈ S(w) if and only if a(x) > 0 and a(w −1 x) < 0 for x ∈ C, that is to say if and only if the hyperplane Ha separates the alcoves C and w −1 C.

1) shows that (a) implies (b), and it is clear that (b) and (c) are equivalent. Finally, if (µ ) ⊂ (λ ) then µ ∈ (λ ) = 2 (λ ), hence µ ∈ λ − Q ∨+ , so that (c) implies (a). 3) we write λ ≥µ. 4) This is the dominance partial ordering on L ++ . 4) that for λ ∈ L the shortest w ∈ W0 such that wλ = λ− is denoted by v(λ ). Also let v¯ (λ ) denote the shortest w ∈ W0 such that wλ+ = λ . Here λ+ is the dominant weight and λ− = w0 λ+ the antidominant weight in the orbit W0 λ , and w0 is the longest element of W0 .