Introduction to Banach algebras, operators, and harmonic analysis
by H. G. Dales

Arising from lecture courses given by the authors, this book gives introductions to important topics in functional analysis at a level ideal for beginning graduate students as well as others interested in the subject. The collection is carefully written to form a coherent and accessible introduction to current research topics.
Banach-AlgebraLokale SpektraltheorieLinearBanach algebrasHarmonic analysisAnalyse harmoniqueAlgebraAmenabilitätBanach, Algèbres deMATHEMATICSFredholm-OperatorOperator theory