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Published in:
1996 | OriginalPaper | Chapter
Banach Algebras
Author : S. S. Kutateladze
Published in: Fundamentals of Functional Analysis
Publisher: Springer Netherlands
Included in: Professional Book Archive
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An element e of an algebra A is called a unity element if e ≠ 0 and ea = ae = a for all a ∈ A. Such an element is obviously unique and is also referred to as the unity or the identity or the unit of A. An algebra A is unital provided that A has unity.