scientific article

zbMATH Open0717.34036MaRDI QIDQ3204784

Jia-Quan Liu

Publication date: 1990

Title of this publication is not available (Why is that?)

zbMATH Keywords

Palais-Smale conditiontopological degreegradient systema priori estimatesaddle-point theoremFourier series expansionextension of the resonance condition

Mathematics Subject Classification ID

Periodic solutions to ordinary differential equations (34C25) Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces (58E05) Nonlinear oscillations and coupled oscillators for ordinary differential equations (34C15) Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations (34C10)

Related Items (3)

On a method of analysis of resonance problems ⋮ A strong resonance problem ⋮ Title not available (Why is that?)

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