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COMODULES AND CONTRAMODULES

Published online by Cambridge University Press:  24 June 2010

ROBERT WISBAUER
Affiliation:
Department of Mathematics, Heinrich Heine University, 40225 Düsseldorf, Germany e-mail: wisbauer@math.uni-duesseldorf.de
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Abstract

Algebras A and coalgebras C over a commutative ring R are defined by properties of the (endo)functors AR – and CR – on the category of R-modules R. Generalising these notions, monads and comonads were introduced on arbitrary categories, and it turned out that some of their basic relations do not depend on the specific properties of the tensor product. In particular, the adjoint of any comonad is a monad (and vice versa), and hence, for any coalgebra C, HomR(C, –), the right adjoint of CR –, is a monad on R. The modules for the monad HomR(C, –) were called contramodules by Eilenberg–Moore and the purpose of this talk is to outline the related constructions and explain the relationship between C-comodules and C-contramodules. The results presented grew out from cooperation with G. Böhm, T. Brzeziński and B. Mesablishvili.

Type
Research Article
Copyright
Copyright © Glasgow Mathematical Journal Trust 2010

References

1.Böhm, G., Brzeziński, T. and Wisbauer, R., Monads and comonads on module categories, J. Algebra 322 (2009), 17191747.CrossRefGoogle Scholar
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