2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77304This paper discusses the question of how to recognize whether an operad is E_n (ie. equivalent to the little n-cubes operad). A construction is given which produces many new examples of E_n operads. This construction is developed in the context of an infinite family of right adjoint constructions for operads. Some other related constructions of E_n operads, so-called generalized tensor products, are also described.12 pages, Latex2e. Notes of a talk given at the Workshop on Operads, Osnabrueck, June 18, 1998Algebraic Topology55P35 (Primary), 18C99 (Secondary)text