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Quadratic forms, weighted eigenfunctions and boundary value problems for nonlinear second order ordinary differential equations. (English) Zbl 0677.34022
Summary: Some known results for different kinds of boundary value problems for second order differential equations are generalized. Different approaches are compared with one another, using topological and variational methods and the theory of weighted eigenvalue problems.

MSC:
34L99 Ordinary differential operators
34A34 Nonlinear ordinary differential equations and systems, general theory
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