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Über Näherungslösungen von nichtlinearen Operatorengleichungen in topologischen Vektorräumen. (German) Zbl 0286.47038

MSC:

47J05 Equations involving nonlinear operators (general)
55M25 Degree, winding number
65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs