'It is highly readable and pedagogical, giving a good level of detail in proofs, but staying concise and keeping its story clear rather than being encyclopedic. Another strength of the textbook is that it is well motivated by applications of functional analysis to other areas of mathematics, with a special emphasis on partial differential equations and quantum mechanics throughout the book.' Pierre Portal, zbMATH Open
1. Banach spaces; 2. The classical Banach spaces; 3. Hilbert spaces; 4. Duality; 5. Bounded operators; 6. Spectral theory; 7. Compact operators; 8. Bounded operators on Hilbert spaces; 9. The spectral theorem for bounded normal operators; 10. The spectral theorem for unbounded normal operators; 11. Boundary value problems; 12. Forms; 13. Semigroups of linear operators; 14. Trace class operators; 15. States and observables; Appendix A. Zorn's lemma; Appendix B. Tensor products; Appendix C. Topological spaces; Appendix D. Metric spaces; Appendix E. Measure spaces; Appendix F. Integration; Appendix G. Notes; References; Index.