Cox-Gorenstein algebras

Abstract

This paper is a first step in the study of nonstandard graded algebras having Poincar\'e duality and their Lefschetz properties. We prove the equivalence between the toric setup and the G-graded one, generalize Macaulay-Matlis duality, introduce Lefschetz properties and prove a Hessian criteria in the G-graded setup. We prove a special case of the Codimension One Conjecture of Cattani-Cox-Dickenstein.