Abstract
In this chapter we present a proof of the Connes–Moscovici index formula, expressing the index of a (twisted) operator \(D\) in a spectral triple \((\mathcal {A},\mathcal {H},D)\) by a local formula. First, we illustrate the contents of this chapter in the context of two examples in the odd and even case: the index on the circle and on the torus.
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