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MathSciNet review: 1565397
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Author: P. R. Halmos
Title: Introduction to Hilbert space and the theory of spectral multiplicity
Additional book information: New York, Chelsea, 1951. 114 pp. $3.25.
Reviewer: E. R. Lorch
Journal: Bull. Amer. Math. Soc. 58 (1952), 412-415