Cohochschild Homology of Chain Coalgebras
نویسنده
چکیده
Generalizing work of Doi and of Idrissi, we define a coHochschild homology theory for chain coalgebras over any commutative ring and prove its naturality with respect to morphisms of chain coalgebras up to strong homotopy. As a consequence we obtain that if the comultiplication of a chain coalgebra C is itself a morphism of chain coalgebras up to strong homotopy, then the coHochschild complex c H (C) admits a natural comultiplicative structure. In particular, if K is a reduced simplicial set and C∗K is its normalized chain complex, then c H (C∗K) is naturally a homotopy-coassociative chain coalgebra. We provide a simple, explicit formula for the comultiplication on c H (C∗K) when K is a simplicial suspension. The coHochschild complex construction is topologically relevant. Given two simplicial maps g, h : K → L, where K and L are reduced, the homology of the coHochschild complex of C∗L with coefficients in C∗K is isomorphic to the homology of the homotopy coincidence space of the geometric realizations of g and h, and this isomorphism respects comultiplicative structure. In particular, there a isomorphism, respecting comultiplicative structure, from the homology of c H (C∗K) to H∗L|K|, the homology of the free loops on the geometric realization of K.
منابع مشابه
Cohochschild and Cocyclic Homology of Chain Coalgebras
Generalizing work of Doi and of Farinati and Solotar, we define coHochschild and cocyclic homology theories for chain coalgebras over any commutative ring and prove their naturality with respect to morphisms of chain coalgebras up to strong homotopy. As a consequence we obtain that if the comultiplication of a chain coalgebra is itself a morphism of chain coalgebras up to strong homotopy, then ...
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