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Some of the good books are:

• Elements of the Theory of Functions and Functional Analysis by Kolmogorov, Fomin.

• Functional Analysis, by F.Riesz and Nagy.

• Functional Analysis : Spectral Theory by V.Sunder. Freely available here.

• Analysis now. By Gert Kjeargård Pedersen. (As suggested by Theo Buehler at $\textbf{Math.SE}$

• Stein, Elias; Shakarchi, R. (2011). Functional Analysis: An Introduction to Further Topics in Analysis. Princeton University Press. ISBN 0691113874.

• Functional Analysis, Sobolev Spaces and Partial Differential Equations (Universitext) by Haim Brezis.

• Elementary Functional Analysis by Georgi E. Shilov.

• Introductory Functional Analysis with Applications by Erwin Kreyszig.

• Notes on Functional Analysis by Rajendra Bhatia. (Hindustan Book Agency.)

• Functional Analysis by S.Kesavan. ( Hindustan Book Agency.)

• Elementary functional analysis By Barbara D. MacCluer

• Functional analysis: an introduction By Yuli Eidelman, Vitali D. Milman, Antonis Tsolomitis (AMS)

• Principles of functional analysis By Martin Schechter. (AMS)

• You may also want to see this thread: Problem books in Functional Analysis

$\textbf{Note.}$ The books which are written in Italics are the ones which I have read partially. The ones which are not in Italics are the ones which I have come to know (by friends, teachers) are good books in Functional Analysis. Also, I really don't know which publisher actually publishes the book in foreign edition written by Kesavan and Bhatia.

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Some of the good books are:

• Elements of the Theory of Functions and Functional Analysis by Kolmogorov, Fomin.

• Functional Analysis, by F.Riesz and Nagy.

• Functional Analysis : Spectral Theory by V.Sunder. Freely available here.

• Analysis now. By Gert Kjeargård Pedersen. (As suggested by Theo Buehler at $\textbf{Math.SE}$

• Stein, Elias; Shakarchi, R. (2011). Functional Analysis: An Introduction to Further Topics in Analysis. Princeton University Press. ISBN 0691113874.

• Functional Analysis, Sobolev Spaces and Partial Differential Equations (Universitext) by Haim Brezis.

• Elementary Functional Analysis by Georgi E. Shilov.

• Introductory Functional Analysis with Applications by Erwin Kreyszig.

• Notes on Functional Analysis by Rajendra Bhatia. (Hindustan Book Agency.)

• Functional Analysis by S.Kesavan. ( Hindustan Book Agency.)

• Elementary functional analysis By Barbara D. MacCluer

• Functional analysis: an introduction By Yuli Eidelman, Vitali D. Milman, Antonis Tsolomitis (AMS)

• Principles of functional analysis By Martin Schechter. (AMS)

• You may also want to see this thread: Problem books in Functional Analysis

$\textbf{Note.}$ The books which are written in Italics are the ones which I have read partially. The ones which are not in Italics are the ones which I have come to know (by friends, teachers) are good books in Functional Analysis. Also, I really don't know which publisher actually publishes the book in foreign edition written by Kesavan and Bhatia.

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Some of the good books are:

• Elements of the Theory of Functions and Functional Analysis by Kolmogorov, Fomin.

• Functional Analysis, by F.Riesz and Nagy.

• Functional Analysis : Spectral Theory by V.Sunder. Freely available here.

• Analysis now. By Gert Kjeargård Pedersen. (As suggested by Theo Buehler at $\textbf{Math.SE}$

• Stein, Elias; Shakarchi, R. (2011). Functional Analysis: An Introduction to Further Topics in Analysis. Princeton University Press. ISBN 0691113874.

• Functional Analysis, Sobolev Spaces and Partial Differential Equations (Universitext) by Haim Brezis.

• Elementary Functional Analysis by Georgi E. Shilov.

• Introductory Functional Analysis with Applications by Erwin Kreyszig.

• Notes on Functional Analysis by Rajendra Bhatia. (Hindustan Book Agency.)

• Functional Analysis by S.Kesavan. ( Hindustan Book Agency.)

• Elementary functional analysis By Barbara D. MacCluer

• You may also want to see this thread: Problem books in Functional Analysis

$\textbf{Note.}$ The books which are written in Italics are the one's ones which I have read partially. The one's ones which are not in Italics are the one's ones which I have come to know (by friends, teachers) are good books in Functional Analysis.