The forcing-axiom conjecture on trivial corona automorphisms

Let A\mathcal{A} be a separable, nonunital C*-algebra, and let its corona be the quotient Q(A)=M(A)/A\mathcal{Q}(\mathcal{A})=\mathcal{M}(\mathcal{A})/\mathcal{A} of its multiplier algebra by A\mathcal{A}. An automorphism of Q(A)\mathcal{Q}(\mathcal{A}) is trivial when its graph, pulled back to the unit balls of the multiplier algebras, is Borel in the strict topologies. Forcing-axiom conjecture. Forcing axioms imply that every automorphism of Q(A)\mathcal{Q}(\mathcal{A}) is trivial. This conjecture complements the Continuum Hypothesis prediction by asserting rigidity of corona automorphisms under forcing axioms; the source does not specify which forcing axioms or provide a resolution.

Sources & referencesView supporting material

Primary source

Paul McKenney, “Reduced products of UHF algebras under forcing axioms”, arXiv:1303.5037 (2013).

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