1. B.P. Rynne and M.A. Youngson, Linear Functional Analysis (Springer SUMS, 2nd edition, 2008), Chapters 2, 4, 5.
  2. E. Kreyszig, Introductory Functional Analysis with Applications (Wiley, revised edition, 1989), Chapters 2, 4.2-4.3, 4.5, 7.1-7.4.
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