521 research outputs found
q-Analogs of symmetric function operators
For any homomorphism V on the space of symmetric functions, we introduce an
operation which creates a q-analog of V. By giving several examples we
demonstrate that this quantization occurs naturally within the theory of
symmetric functions. In particular, we show that the Hall-Littlewood symmetric
functions are formed by taking this q-analog of the Schur symmetric functions
and the Macdonald symmetric functions appear by taking the q-analog of the
Hall-Littlewood symmetric functions in the parameter t. This relation is then
used to derive recurrences on the Macdonald q,t-Kostka coefficients.Comment: 17 pages - minor revisions to appear in Discrete Mathematics issue
for LaCIM'200
q and q,t-Analogs of Non-commutative Symmetric Functions
We introduce two families of non-commutative symmetric functions that have
analogous properties to the Hall-Littlewood and Macdonald symmetric functions.Comment: Different from analogues in math.CO/0106191 - v2: 26 pages - added a
definition in terms of triangularity/scalar product relations - to be
submitted FPSAC'0
Hall-Littlewood vertex operators and generalized Kostka polynomials
A family of vertex operators that generalizes those given by Jing for the
Hall-Littlewood symmetric functions is presented. These operators produce
symmetric functions related to the Poincare polynomials referred to as
generalized Kostka polynomials in the same way that Jing's operator produces
symmetric functions related to Kostka-Foulkes polynomials. These operators are
then used to derive commutation relations and new relations involving the
generalized Kostka coefficients. Such relations may be interpreted as
identities in the (GL(n) x C^*)-equivariant K-theory of the nullcone.Comment: 17 page
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