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Singular sets and number of solutions of nonlinear boundary value problems. (English) Zbl 0529.35027

MSC:
35J65 Nonlinear boundary value problems for linear elliptic equations
35P30 Nonlinear eigenvalue problems and nonlinear spectral theory for PDEs
35A05 General existence and uniqueness theorems (PDE) (MSC2000)
47A53 (Semi-) Fredholm operators; index theories
47B06 Riesz operators; eigenvalue distributions; approximation numbers, \(s\)-numbers, Kolmogorov numbers, entropy numbers, etc. of operators
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