Definition 7.1.5 (Unital Banach Algebra).label A Banach algebra with an identity is said to be unital and by Proposition 7.1.4 we assume that the norm of the identity is one if it exits.
/Part 4: Operator Algebra/Chapter 7: Fundamentals of Banach Algebras and C*-Algebras/Section 7.1: Banach Algebras
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