2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/231473Objects dual to graded algebras are subproduct systems of linear spaces, a purely algebraic counterpart of a notion introduced recently in the context of noncommutative dynamics (Shalit and Solel, Bhat and Mukherjee). A complete classification of these objects in the lowest nontrivial dimension is given in this work, triggered by a question of Bhat.21 pagesRings and Algebrastext