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http://sacred-texts.com/phi/mill/liberty.txt

https://www.encyclopediaofmath.org/index.php/Adjoint_operator

[1] K. Yosida, "Functional analysis" , Springer (1980)
[2] F. Riesz, B. Szökefalvi-Nagy, "Functional analysis" , F. Ungar (1955) (Translated from French)
[3] A.E. Taylor, D.C. Lay, "Introduction to functional analysis" , Wiley (1980)

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