Definition 6.1.5: Unital Banach Algebra | The Eigenspace

/Part 4: Operator Algebra/Chapter 6: Fundamentals of Banach Algebras and C*-Algebras/Section 6.1: Banach Algebras

Definition 6.1.5 (Unital Banach Algebra).label A Banach algebra with an identity is said to be unital and by Proposition 6.1.4 we assume that the norm of the identity is one if it exits.

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Proposition 6.1.4

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