A new row-insertion bijection shows dual Dyck symmetric functions are Schur-positive and supplies a two-column Dyck tableau formula plus a skeleton formula for C_n(q,t) when the deficit is at most 2n-8.
Garsia and Mark Haiman
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Dyck Symmetric Functions and Applications to \(q,t\)-Catalan Polynomials
A new row-insertion bijection shows dual Dyck symmetric functions are Schur-positive and supplies a two-column Dyck tableau formula plus a skeleton formula for C_n(q,t) when the deficit is at most 2n-8.