PERTURBATION OF THE LIMIT CIRCLE CASE

DOI10.1093/qmath/26.1.355zbMath0325.34022OpenAlexW2093986721MaRDI QIDQ4089143

Anton Zettl

Publication date: 1975

Published in: The Quarterly Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1093/qmath/26.1.355

Mathematics Subject Classification ID

Topological structure of integral curves, singular points, limit cycles of ordinary differential equations (34C05) Weyl theory and its generalizations for ordinary differential equations (34B20) Linear ordinary differential equations and systems (34A30)

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On $$L_w^2 $$ -quasi-derivatives for solutions of perturbed general quasi-differential equations ⋮ On the integrability of solutions of perturbed non-linear differential equations ⋮ On the essential spectra of regularly solvable operators in the direct sum spaces

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