By Alexander Kleshchev
The illustration concept of symmetric teams is among the most pretty, renowned, and critical components of algebra with many deep kinfolk to different parts of arithmetic, akin to combinatorics, Lie thought, and algebraic geometry. Kleshchev describes a brand new method of the topic, in keeping with the new paintings of Lascoux, Leclerc, Thibon, Ariki, Grojnowski, Brundan, and the writer. a lot of this paintings has simply seemed within the learn literature earlier than. although, to make it obtainable to graduate scholars, the speculation is built from scratch, the single prerequisite being a customary path in summary algebra. Branching ideas are in-built from the outset leading to a proof and generalization of the hyperlink among modular branching ideas and crystal graphs for affine Kac-Moody algebras. The equipment are merely algebraic, exploiting affine and cyclotomic Hecke algebras. For the 1st time in booklet shape, the projective (or spin) illustration conception is taken care of alongside an identical strains as linear illustration concept. the writer is especially keen on modular illustration concept, even supposing every little thing works in arbitrary attribute, and in case of attribute zero the method is slightly just like the idea of Okounkov and Vershik, defined the following in bankruptcy 2. For the sake of transparency, Kleshschev concentrates on symmetric and spin-symmetric teams, even though the equipment he develops are really normal and follow to a couple of comparable gadgets. In sum, this exact e-book could be welcomed by means of graduate scholars and researchers as a latest account of the topic.
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Additional info for Linear and projective representations of symmetric groups
2, we have a right from now on to identify n and n with the corresponding subalgebras of n . Then n is a free right n -module on ∈ n . As another consequence, if m ≤ n, we can consider m a basis x as the subalgebra of n generated by x1 xm , s1 sm−1 . 2: ∈ n+ as a basis. 1. 3 The center of n The following simple description of the center is very important. 1 The center of x1 xn . 9). Conversely, take a central element z = w∈Sn fw w ∈ n where each fw ∈ n . Let w be maximal with respect to the Bruhat order such that n with wi = i.
Moreover, each vector wT is a simultaneous eigenvector for Ln−k+1 Ln ∈ n−k k with eigenvalues res Tk , respectively. 6 Let / be a skew shape with / k 1 2 = −1 L / = k. Then / if / is a skew hook, otherwise. 0 The following is a very effective way to evaluate an irreducible character on a given element. 7 (Murnaghan–Nakayama rule) Let / be a skew shape with / = k, and c be an element of Sk whose cycle shape corresponds to a partition = 1 ≥ · · · ≥ l > 0 ∈ k . Then / c = −1 LH H where the sum is over all sequences H of partitions = 0 ⊂ 1 ⊂ ··· ⊂ l = such that i / i − 1 is a skew hook with 1 ≤ i ≤ l, and L H = li=1 L i / i − 1 .
3 Degenerate affine Hecke algebra In this chapter we define the degenerate affine Hecke algebra n . As a vector xn of the group algebra space, n is the tensor product FSn ⊗ F x1 xn . Moreover, FSn and the free commutative polynomial algebra F x1 xn are subalgebras of n isomorphic to FSn and FSn ⊗ 1 and 1 ⊗ F x1 xn , respectively. Furthermore, there exists an algebra homomorF x1 phism n → FSn , which is the “identity” on the subalgebra FSn , that is sends w ⊗1 to w, see Chapter 7. 1. In particular, the center of n is what we would like it to be: the ring of symmetric polynomials xn Sn .