Mathematics – Category Theory
Scientific paper
2006-03-14
Mathematics
Category Theory
Spanish. An English version will be published in the future. Some of the results in the first version were already familiar fo
Scientific paper
Starting from a comonad G on a category A, and a functor L : B -> A with a right adjoint R : A -> B, we will give a parametrization of the functors K from B to the category of all G-coalgebras that factorize throughout L in terms of homomorphisms of comonads from LR to G. Next, we will see under which conditions one of these functors K admits a right adjoint D. We will characterize when D is full and faithful, and we will conclude our general results by characterizing when K establishes an equivalence between the category B and the category of G-coalgebras. Obviously, the functors characterized in this way are, a fortiori, comonadic but, in contrast with the approach of Beck's Theorem, the comonad G is here given beforehand, and each functor K corresponds to a ``representation'' of G. Beck's theorem deals with the situation where G = LR. We apply our general results to the case of corings over firm rings.
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