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Theoretical Computer Science
Volume 366, Issues 1-2, 16 November 2006, Pages 82-97
Algebra and Coalgebra in Computer Science
 
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doi:10.1016/j.tcs.2006.07.004    How to Cite or Link Using DOI (Opens New Window)
Copyright © 2006 Elsevier B.V. All rights reserved.

The intersection of algebra and coalgebrastar, open

J. Adámeka, E-mail The Corresponding Author

aTechnical University of Braunschweig, P.O. Box 3329, 38023 Braunschweig, Germany

Available online 20 July 2006.

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Abstract

Presheaf categories are well-known to be varieties of algebras and covarieties of coalgebras. We prove the converse: if a category is a variety as well as a covariety, then it is a presheaf category. Our main result is that all coalgebras on a set functor H form a presheaf category iff H is a reduction of a polynomial functor.

Keywords: Variety; Covariety; Presheaf category

Mathematical subject codes: 18C05; 18B20; 08B99; 18C20


Theoretical Computer Science
Volume 366, Issues 1-2, 16 November 2006, Pages 82-97
Algebra and Coalgebra in Computer Science
 
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