Abstract
Lapid and Mínguez gave a criterion of the irreducibility of the parabolic induction $\sigma \times \pi$, where $\sigma$ is a ladder representation and $\pi$ is an arbitrary irreducible representation of the general linear group over a non-archimedean field. Through quantum affine Schur-Weyl duality, when $k$ is large enough, this gives a criterion of the irreducibility of the tensor product of a snake module $L(M)$ and any simple module $L(N)$ of the quantum affine algebra $Uq(\widehat{\mathfrak{sl}k})$. The goal of this paper is to add conditions to their criterion such that it works for any $k \geq 1$. We prove the criterion in the case that $L(M)$, $L(N)$ are snake modules or $M=Y_{1,s}$ for some $s \in \mathbb{Z}$, $L(N)$ is any simple module. We also defined a similar criterion in terms of two tableaux and show that for any $k \geq 1$, two ladders in the Grassmannian cluster algebra $\mathbb{C}[\mathrm{Gr}(k,n, \sim)]$ are compatible if and only if the corresponding tableaux satisfy the criterion. This generalizes Leclerc and Zelevinsky’s result that two Plücker coordinates are compatible if and only if they are weakly separated.
