Abstract
We present a fairly general construction of unbounded representatives for the interior Kasparov product. As a main tool we develop a theory of C1-connections on operator ⁎-modules; we do not require any smoothness assumptions; our σ-unitality assumptions are minimal. Furthermore, we use work of Kucerovsky and our recent Local Global Principle for regular operators in Hilbert C⁎-modules.As an application we show that the Spectral Flow Theorem and more generally the index theory of Dirac–Schrödinger operators can be nicely explained in terms of the interior Kasparov product.
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