A combinatorial interpretation for certain plethysm and Kronecker coefficients

Igor Pak, Greta Panova, Joshua P. Swanson

We give explicit positive combinatorial interpretations for the plethysm coefficients $⟨s_{\hat{I}}¼[s_{\hat{I}}½],s_{\hat{I}}»⟩$, when $\hat{I}»$ has at most two rows, as counting certain marked…