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Nonlinear boundary value problems with concave nonlinearities near the origin. (English) Zbl 0983.35052
The author considers the effect of concave nonlinearities for the solution structure of nonlinear boundary value problems such as Dirichlet and Neumann boundary value problems of elliptic equations, periodic boundary value problems for the Hamiltonian systems, and nonlinear wave equations.
Reviewer: Jiaqi Mo (Wuhu)

MSC:
35J65 Nonlinear boundary value problems for linear elliptic equations
35J60 Nonlinear elliptic equations
35Q55 NLS equations (nonlinear Schrödinger equations)
35L70 Second-order nonlinear hyperbolic equations
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