For vexillary permutations, the double beta-Edelman-Greene coefficients are shown to be sums of Graham-positive monomials indexed by semistandard set-valued tableaux, with new restrictions on the types of factors appearing.
Stable Grothendieck polynomials an d K-theoretic factor sequences
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Tableau formula for vexillary double Edelman--Greene coefficients
For vexillary permutations, the double beta-Edelman-Greene coefficients are shown to be sums of Graham-positive monomials indexed by semistandard set-valued tableaux, with new restrictions on the types of factors appearing.