The Gelfand transform x↦x^^ is defined as follows. If ϕ:B->C is linear and multiplicative in the senses ϕ(a x + b y) = a ϕ(x) + b ϕ(y) and ϕ(x y) = ϕ(x) ϕ(y), where B is a commutative Banach algebra, then write x^^(ϕ) = ϕ(x). The Gelfand transform is automatically bounded.
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