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Electronic Notes in Theoretical Computer Science, Warsaw : Pologne (2003)
Logical Construction of Final Coalgebras
Luigi Santocanale 1
(2003)

We prove that every finitary polynomial endofunctor of a category $C$ has a final coalgebra if $C$ is locally Cartesian closed, has finite disjoint coproducts and a natural number object. More generally, we prove that the category of coalgebras for such an endofunctor has all finite limits.
1:  Laboratoire d'informatique Fondamentale de Marseille (LIF)
CNRS : UMR6166 – Université de la Méditerranée - Aix-Marseille II – Université de Provence - Aix-Marseille I
Physics/Condensed Matter/Soft Condensed Matter
Fulltext link: 
http://fr.arXiv.org/abs/math.CT/0403227