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On the existence of solution of the equation L(x)=N(x) and a generalized coincidence degree theory. I. (English) Zbl 0463.47046

MSC:
47J05 Equations involving nonlinear operators (general)
47H10 Fixed-point theorems
47A50 Equations and inequalities involving linear operators, with vector unknowns
47A55 Perturbation theory of linear operators
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