By F. F. Bonsall
The idea of the numerical variety of a linear operator on an arbitrary normed area had its beginnings round 1960, and through the Nineteen Seventies the topic has constructed and improved speedily. This booklet offers a self-contained exposition of the topic as an entire. The authors increase numerous functions, particularly to the examine of Banach algebras the place the numerical diversity offers a major hyperlink among the algebraic and metric buildings.
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