Non-commutative Pieri operators on posets

Details Non-commutative Pieri operators on posets Non-commutative Pieri operators on posets

2000-02-10

arxiv.org/abs/math/0002073v2

J. Combin. Th. Ser. A, Vol. 91, No. 1/2, Aug 2000, pp. 84-110.

Mathematics

Combinatorics

LaTeX 2e, 22 pages Minor corrections, updated references. Complete and final version, to appear in issue of J. Combin. Th. Ser

Scientific paper

We consider graded representations of the algebra NC of noncommutative symmetric functions on the Z-linear span of a graded poset P. The matrix coefficients of such a representation give a Hopf morphism from a Hopf algebra HP generated by the intervals of P to the Hopf algebra of quasi-symmetric functions. This provides a unified construction of quasi-symmetric generating functions from different branches of algebraic combinatorics, and this construction is useful for transferring techniques and ideas between these branches. In particular we show that the (Hopf) algebra of Billera and Liu related to Eulerian posets is dual to the peak (Hopf) algebra of Stembridge related to enriched P-partitions, and connect this to the combinatorics of the Schubert calculus for isotropic flag manifolds.

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