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Classifying $^*$-homomorphisms I: Unital simple nuclear $C^*$-algebras

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arxiv 2307.06480 v4 pith:D4LATUEG submitted 2023-07-12 math.OA math.KT

classification math.OAmath.KT
keywords unitalalgebranuclearseparablesimpletheoremalgebrascoefficient
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abstract

We classify the unital embeddings of a unital separable nuclear $C^*$-algebra satisfying the universal coefficient theorem into a unital simple separable nuclear $C^*$-algebra that tensorially absorbs the Jiang--Su algebra. This gives a new and essentially self-contained proof of the stably finite case of the unital classification theorem: unital simple separable nuclear $C^*$-algebras that absorb the Jiang--Su algebra tensorially and satisfy the universal coefficient theorem are classified by Elliott's invariant of $K$-theory and traces.

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