Automatic continuity and spatial form of biseparating maps between C*-algebras

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Let A1\mathcal{A}_{1} and A2\mathcal{A}_{2} be CC^{\ast}-algebras, and let T:A1A2T:\mathcal{A}_{1}\to\mathcal{A}_{2} be a biseparating map, meaning that both TT and T1T^{-1} preserve disjointness in the relevant algebraic sense. Let Ψ:A1A2\Psi:\mathcal{A}_{1}\to\mathcal{A}_{2} denote the associated map, and let A0A_{0} belong to the commutant of A2\mathcal{A}_{2}. Automatic continuity and spatial-form conjecture. The map TT is continuous and

T(a)=A0Ψ(a),aA1.T(a)=A_{0}\circ\Psi(a),\qquad a\in\mathcal{A}_{1}.

The claim describes the expected structure of biseparating maps between CC^{\ast}-algebras, combining automatic continuity with multiplication by an element commuting with the target algebra. The supplied text does not establish the assertion or state its resolution, so its status is left open.

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Primary source

Jesus Araujo and Krzysztof Jarosz, “Biseparating maps between operator algebras”, arXiv:math/0106107 (2001).

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