Functional analysis /
Riesz, Frigyes,1880-1956.
Szőkefalvi-Nagy, Béla,1913-
New York : Dover Publications ; London : Constable,
1990.
Translation of: Leçons d'analyse fonctionelle.
"An unabridged republication of the work first published by Frederick Ungar Publishing Co., New York, in 1955.  The appendix, Extensions of linear transformations in Hilbert space which extend beyond this space, separately published by Ungar in 1960, has been added to this edition"--T.p. verso.
Functional analysis.