On the Spectra of Slightly Disturbed Linear Oscillators

DOI10.2307/2372094zbMath0031.40201OpenAlexW2324362380MaRDI QIDQ5788345

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Publication date: 1949

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

Full work available at URL: https://doi.org/10.2307/2372094

zbMATH Keywords

Ordinary differential equations

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Gaps in the essential spectrum of pseudo differential operators ⋮ A note on inverses of differential operators

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