Returns the skew t-Schur polynomial associated to the given skew partition.
tSkewSchurPol(n, lambda, mu)A symbolicQspray multivariate polynomial, the skew
t-Schur polynomial associated to the skew partition defined by
lambda and mu.
It has a single parameter usually denoted by \(t\) and its
coefficients are polynomials in this parameter. Substituting
\(t\) with \(0\) yields the skew Schur polynomials.
number of variables, a positive integer
integer partitions defining the skew partition:
lambda is the outer partition and mu is the inner partition
(so mu must be a subpartition of lambda)