Halmos, Paul R. 1916-2006. A Hilbert space problem book / [by] Paul R. Halmos. - Princeton, N.J. : Van Nostrand, c1967. - xvii, 365 p. : ill. ; 24 cm. Bibliography: p. 352-357 & Index. Subjects--Topical Terms: Hilbert space--Problems, exercises, etc. Dewey Class. No.: 515.733 / HAH 1967