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Fröhlich, J. Unbounded, symmetric semigroups on a separable Hilbert space are essentially selfadjoint. (English) Zbl 0452.47043 Adv. Appl. Math. 1, 237-250 (1980). MSC: 47D03 47B25 PDFBibTeX XMLCite \textit{J. Fröhlich}, Adv. Appl. Math. 1, 237--256 (1980; Zbl 0452.47043) Full Text: DOI