“…However, their argument (specialize the Cauchy identity for Schur functions), if carefully completed, would also give a proof of (9.10), after some work. It should also be remarked, that by a general theorem of Remmel and Yang [38,Theorem 3.1], the expansion (9.9) (and hence also (9.10)) is multiplicity-free. It should be noted that (9.10) is related to a special case of (3.5) with a horizontal shift S. More precisely, in Proposition 1 take u i = (i, 1), v i = (λ i + i, ∞), i = 1, 2, .…”