Conditions for the Spectrum in Eigenfunction Theory to be Bounded below and Discrete for λ < 0 II
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Publication:5544923
DOI10.1112/jlms/s1-44.1.177zbMath0159.40401OpenAlexW2067228486MaRDI QIDQ5544923
Publication date: 1969
Published in: Journal of the London Mathematical Society (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1112/jlms/s1-44.1.177
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