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On the abstract approach to spectral constants: a proof of the Clouâtre--Ostermann--Ransford conjecture
Clouâtre, Ostermann, and Ransford formulated an abstract version of Crouzeix's conjecture involving a bounded unital homomorphism from a uniform algebra into matrices and a unital antilinear map. They conjectured that contractivity of the associated symmetrised map forces the homomorphism to have no
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