2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/79578In this paper we describe how to give a particular global category of rings and modules the structure of a relaxed multi category, and we describe an algebra in this relaxed multi category such that vertex algebras appear as such algebras.19 pages, xy-pic, epsfig. Updated version to appear in the Journal of Pure and Applied Algebra including various corrections and additional citationsCategory TheoryQuantum AlgebraRings and Algebrastext