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Existence and oscillation theorems for non-linear differential systems of the second order
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1928
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Nonlinear Functional AnalysisOscillation TheoremsCharacteristic NumberVanishing SolutionOscillation TheorySecond OrderBifurcation TheoryNon-linear Differential SystemsNonlinear OscillationStability
By a characteristic number we mean a value of X for which the system has a non-indentically vanishing solution.