A new characterization for the m-quasiinvariants of S_n and explicit basis for two row hook shapes

Details A new characterization for the m-quasiinvariants of S_n and explicit basis for two row hook shapes A new characterization for the m-quasiinvariants of S_n and explicit basis for two row hook shapes

2007-07-21

arxiv.org/abs/0707.3174v2

J. Combin. Theory Ser. A 115 (2008), no. 8, 1333--1357

Mathematics

Combinatorics

26 pages, uses youngtab.sty

Scientific paper

In 2002, Feigin and Veselov defined the space of m-quasiinvariants for any Coxeter group, building on earlier work of Chalykh and Veselov. While many properties of those spaces were proven from this definition, an explicit computation of a basis was only done in certain cases. In particular, Feigin and Veselov computed bases for the m-quasiinvariants of dihedral groups, including S_3, and Felder and Veselov computed the non-symmetric m-quasiinvariants of lowest degree for general S_n. In this paper, we provide a new characterization of the m-quasiinvariants of S_n, and use this to provide a basis for the isotypic component indexed by the partition [n-1,1]. This builds on a previous paper in which we computed a basis for S_3 via combinatorial methods.

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