Restriction coefficients for partitions with at most three columns

Mitchell Lee

Let $r\ge 0$, and let $\hat{I}»$ and $\hat{I}¼$ be partitions such that $\hat{I}{»}_1\le r+1$. We present a combinatorial interpretation of the plethysm coefficient $\langle s_λ, s_μ[s_r] \ran…