Introduction to Spectral Theory in Hilbert Space
By Gilbert Helmberg. (North-Holland Series in Applied Mathematics and Mechanics, Vol. 6.) Pp. xiii + 346. (North-Holland: Amsterdam and London, 1969.) 140s.
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EVERITT, W. Hilbert Spaces. Nature 224, 825 (1969). https://doi.org/10.1038/224825a0
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DOI: https://doi.org/10.1038/224825a0