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Covering Dimension of C*-Algebras and 2-Coloured Classification (Paperback)
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Covering Dimension of C*-Algebras and 2-Coloured Classification (Paperback)
Series: Memoirs of the American Mathematical Society
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The authors introduce the concept of finitely coloured equivalence
for unital $^*$-homomorphisms between $\mathrm C^*$-algebras, for
which unitary equivalence is the $1$-coloured case. They use this
notion to classify $^*$-homomorphisms from separable, unital,
nuclear $\mathrm C^*$-algebras into ultrapowers of simple, unital,
nuclear, $\mathcal Z$-stable $\mathrm C^*$-algebras with compact
extremal trace space up to $2$-coloured equivalence by their
behaviour on traces; this is based on a $1$-coloured classification
theorem for certain order zero maps, also in terms of tracial data.
As an application the authors calculate the nuclear dimension of
non-AF, simple, separable, unital, nuclear, $\mathcal Z$-stable
$\mathrm C^*$-algebras with compact extremal trace space: it is 1.
In the case that the extremal trace space also has finite
topological covering dimension, this confirms the remaining open
implication of the Toms-Winter conjecture. Inspired by
homotopy-rigidity theorems in geometry and topology, the authors
derive a ``homotopy equivalence implies isomorphism'' result for
large classes of $\mathrm C^*$-algebras with finite nuclear
dimension.
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