2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64765We study a certain truncation of the ring of arithmetical functions with unitary convolution, consisting of functions vanishing on arguments >n. The truncations are artinian monomial quotients of a polynomial ring in finitely many indeterminates, and are isomorphic to the ``artinified'' Stanley-Reisner rings of certain simplicial complexes.23 pagesCommutative AlgebraThe ring of arithmetical functions with unitary convolution: the [n]-truncationtext