2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/229175This paper describes a higher-categorical version of the theory of colored operads, giving applications to the study of commutative ring spectra.188 pages. Modified 9/19/07: minor changes, added material on the Day convolution product. 5/4/09: Almost completely rewritten, using a higher categorical language of colored operadsCategory TheoryAlgebraic Topology55P43; 18D10text