A Noncrossing Basis for Noncommutative Invariants of SL(2,C)

Details A Noncrossing Basis for Noncommutative Invariants of SL(2,C) A Noncrossing Basis for Noncommutative Invariants of SL(2,C)

2009-05-12

arxiv.org/abs/0905.1860v1

Mathematics

Combinatorics

AMS LaTeX, 13 pages, using Asymptote pictures

Scientific paper

Noncommutative invariant theory is a generalization of the classical invariant theory of the action of $SL(2,\IC)$ on binary forms. The dimensions of the spaces of invariant noncommutative polynomials coincide with the numbers of certain noncrossing partitions. We give an elementary combinatorial explanation of this fact by constructing a noncrossing basis of the homogeneous components. Using the theory free stochastic measures this provides a combinatorial proof of the Molien-Weyl formula in this setting.

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