Abstract
We describe the Kasparov group KK(A, B) as the set of homotopy classes of homomorphisms from an algebra qA associated with A into K? B. The algebra qA consists of ‘K-theory differential forms’ over A. Its construction is dual to that of M2(A). The analysis of qA and of its interplay with M2(A) gives the basic results of KK-theory.

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