Positselski duality in stable $\infty$-categories

Abstract: We introduce the notion of a contramodule over an $\mathbb{E}\infty$-coalgebra in a presentably symmetric monoidal $\infty$-category $\mathcal{C}$. Based on this we prove that local duality, in the sense of Hovey--Palmieri--Strickland and Dwyer--Greenlees, is equivalent to Positselski's comodule-contramodule correspondence for idempotent $\mathbb{E}\infty$-coalgebras in compactly generated symmetric monoidal stable $\infty$-cateogories.