Extension of characters in commutative Banach algebras
Gustavo Corach, Fernando Suárez (1987)
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Let A be a complex Banach algebra with a unit e, let T, φ be continuous functionals, where T is linear, and let F be a nonlinear entire function. If T ∘ F = F ∘ φ and T(e) = 1 then T is multiplicative.
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