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The purpose of this paper is to set up a theory of generalized operads and multicategories and to use it as a language in which to propose a definition of weak n-category. Included is a full explanation of why the proposed definition of n-category is a reasonable one, and of what happens when n is less than or equal to 2. Generalized operads and multicategories play other parts in higher-dimensional algebra too, some of which are outlined here: for instance, they can be used to simplify the opetopic approach to n-categories expounded by Baez, Dolan and others, and are a natural language in which to discuss enrichment of categorical structures.
@article{TAC_2004_12_a2, author = {Tom Leinster}, title = {Operads in higher-dimensional category theory}, journal = {Theory and applications of categories}, pages = {73--194}, publisher = {mathdoc}, volume = {12}, year = {2004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TAC_2004_12_a2/} }
Tom Leinster. Operads in higher-dimensional category theory. Theory and applications of categories, Tome 12 (2004), pp. 73-194. http://geodesic.mathdoc.fr/item/TAC_2004_12_a2/