Igusa-type functions associated to finite formed spaces and their functional equations

Details Igusa-type functions associated to finite formed spaces and their functional equations Igusa-type functions associated to finite formed spaces and their functional equations

2006-03-23

arxiv.org/abs/math/0603565v2

Mathematics

Group Theory

Slightly revised version, to appear in Trans. Amer. Math. Soc.

Scientific paper

We study symmetries enjoyed by the polynomials enumerating non-degenerate flags in finite vector spaces, equipped with a non-degenerate alternating bilinear, hermitian or quadratic form. To this end we introduce Igusa-type rational functions encoding these polynomials and prove that they satisfy certain functional equations. Some of our results are achieved by expressing the polynomials in question in terms of what we call parabolic length functions on Coxeter groups of type $A$. While our treatment of the orthogonal case exploits combinatorial properties of integer compositions and their refinements, we formulate a precise conjecture how in this situation, too, the polynomials may be described in terms of parabolic length functions.

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