A lowering-operator formula expresses closed K-k-Schur functions as sums of K-k-Schur functions in the Bruhat order, yielding a new proof of a theorem by Ikeda, Iwao and Naito.
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Lowering operators on $K$-$k$-Schur functions and a lowering operator formula for closed $K$-$k$-Schur functions
A lowering-operator formula expresses closed K-k-Schur functions as sums of K-k-Schur functions in the Bruhat order, yielding a new proof of a theorem by Ikeda, Iwao and Naito.