On the Discreteness of the Spectrum in Eigenfunction Theory
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Publication:5531317
DOI10.1112/jlms/s1-42.1.309zbMath0152.11403OpenAlexW2068817695MaRDI QIDQ5531317
Publication date: 1967
Published in: Journal of the London Mathematical Society (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1112/jlms/s1-42.1.309
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