Titolo: A type sound formalization of imp-$\varsigma$ in Coq Autori: Alberto Ciaffaglione, Luigi Liquori, Marino Miculan We encode the Abadi-Cardelli's imp-$\varsigma$ calculus in Coq using an higher-order approach. We formalize the syntax, the first-order static semantics and the big-step dynamic semantics. The ultimate goal is to obtain a Type Soundness result in Coq.