Download e-book for iPad: Characters of Finite Coxeter Groups and Iwahori-Hecke by Meinolf Geck

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By Meinolf Geck

ISBN-10: 0198502508

ISBN-13: 9780198502500

Finite Coxeter teams and similar buildings come up certainly in numerous branches of arithmetic equivalent to the idea of Lie algebras and algebraic teams. The corresponding Iwahori-Hecke algebras are then received through a undeniable deformation approach that have purposes within the illustration idea of teams of Lie kind and the idea of knots and hyperlinks. This booklet develops the idea of conjugacy periods and irreducible personality, either for finite Coxeter teams and the linked Iwahori-Hecke algebras. themes coated diversity from classical effects to newer advancements and are transparent and concise. this is often the 1st booklet to increase those topics either from a theoretical and an algorithmic viewpoint in a scientific method, protecting all kinds of finite Coxeter teams.

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Extra info for Characters of Finite Coxeter Groups and Iwahori-Hecke Algebras

Sample text

Thus r Q(G ) = {L. adG / Gi] I ai E Z} , i= ' the free abelian group generated by the isomorphism types of transitive G-sets. We define a multiplication in Q ( G ) by the Cartesian product of G-sets. If X and Y are G-sets then so is X x Y (via (x, y ) . g = (x . 1. The Burnside ring. for all isomorp�ism types of G-sets in Q ( G ) . Then this multiplication is com­ mutative, with the class of the trivial G-set [GIG] as identity and it distributes over the disjoint union of G-sets, thus turning Q ( G ) into a commutative ring.

Now the fact that WM is a prefix of wJw is equivalent to the fact that each S E M is a prefix of wJw . As seen before, d � U{s} is a prefix 71 Bibliograpbical remarks and exercises of W if and only if W E XJ and t is a prefix of wJ for all t E J and t = s. 10. Given a directed labelled graph f with vertices V and edges E, let the reversed grapb rev f be the graph which is obtained from f by reversing the edges. That is, rev r has vertex set V and edge set {V2 --Lt v, I v, --Lt V2 E E}. Show that for J � S the reversed graph rev f�s isomorphic to the coset graph rJ , where J ' = JWo .

An) = ( 1 11 , . . , n n ) correspond to J. 8) , we have • • • - . - . • • - and the number lk of parts k in A is determined by lk+ 1 , . . 14. Let G be a finite group, let H :::; G be a normal subgroup of index 2 and let X be a transitive G-set. Then, by restriction, X is an H-set. Show that, if X is not a transitive H-set, then X = X l II X2 , where Xl and X2 are 72 Parabolic subgroups transitive H-sets which are in bijection via X2 = Xl . g = {x . g I x E X l } for any 9 E G H. Moreover, in that case, Xl ;p X2 as H-sets if and only if the normalizer in G of a point stabilizer is a subgroup of H.

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Characters of Finite Coxeter Groups and Iwahori-Hecke Algebras by Meinolf Geck

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