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Abstract
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We define the notion of a multi-sorted algebraic theory, which is a generalization of
an algebraic theory in which the objects are of different “sorts.” We prove a
rigidification result for simplicial algebras over these theories, showing that there is a
Quillen equivalence between a model category structure on the category of strict
algebras over a multi-sorted theory and an appropriate model category structure on
the category of functors from a multi-sorted theory to the category of simplicial sets.
In the latter model structure, the fibrant objects are homotopy algebras
over that theory. Our two main examples of strict algebras are operads in
the category of simplicial sets and simplicial categories with a given set of
objects.
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Keywords
algebraic theories, model categories, operads, simplicial
categories
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Mathematical Subject Classification 2000
Primary: 18C10
Secondary: 18G30, 18E35, 55P48
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Publication
Received: 9 August 2005
Revised: 8 September 2006
Accepted: 29 September 2006
Published: 14 November 2006
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