Projective dimension of powers of cover ideal of Ferrers graphs

Abstract

Let $λ= (λ_1, \ldots, λ_n)$ be a partition with $λ_1 = m$. Denote by $J_λ$ the cover ideal in the polynomial ring \( S = k[x_1, \ldots, x_n, y_1, \ldots, y_m] \) associated to the Ferrers graph corresponding to $λ$. Let $d(λ)$ denote the number of distinct parts of $λ$. We prove that \[ \operatorname{pd}(S/J_λ^t) = \min\{t,\; d(λ)\} + 1 \] for all $t \ge 1$.