Expanding quasisymmetric Schur $Q$-functions into peak Young quasisymmetric Schur functions (2406.12751v1)

Abstract: The dual immaculate and Young quasisymmetric Schur bases of quasisymmetric functions possess analogues in the peak algebra: respectively, the quasisymmetric Schur $Q$-functions and the peak Young quasisymmetric Schur functions. We show elements of the former basis expand into the latter basis with nonnegative coefficients.