1. B.P. Rynne and M.A. Youngson, Linear Functional Analysis (Springer SUMS, 2nd edition, 2008), Chapters 3, 4.4, 6.
  2. E. Kreyszig, Introductory Functional Analysis with Applications (Wiley, revised edition, 1989), Chapters 3, 4.7-4.9, 4.12-4.13, 9.1-9.2.
  3. N. Young, An Introduction to Hilbert Space (Cambridge University Press, 1988), Chs 1-7.
Further Reading:
  1. E.M. Stein and R. Shakarchi, Real Analysis: Measure Theory, Integration & Hilbert Spaces (Princeton Lectures in Analysis III, 2005), Chapter 4.
  2. M. Reed and B. Simon, Methods of Modern Mathematical Physics Vol. I. Functional Analysis (Academic Press, 1980).
  3. H. Brezis, Functional Analysis, Sobolev Spaces and Partial Differential Equations (Universitext. Springer, 2011).
  4. P. Lax, Functional Analysis (Wiley, 2012).
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