Z. Fiedorowicz
Published 1998-08-19, updated 1999-01-24Version 2
This 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.
Comments: 12 pages, Latex2e. Notes of a talk given at the Workshop on Operads, Osnabrueck, June 18, 1998
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