On the Unboundedness of the Essential Spectrum

DOI10.2307/2372263zbMath0048.32401OpenAlexW2330044720MaRDI QIDQ5815043

C. R. Putnam

Publication date: 1952

Published in: American Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.2307/2372263

zbMATH Keywords

ordinary differential equations

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