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Integral equations, implicit functions, and fixed points. (English) Zbl 0873.45003

The author is concerned with a generalized integral equation of the form

V(t,x)=St , 0 t H (t,s,x(s)) d s

in the space of continuous functions. The operator V will define a contraction V ˜, while the operator S is assumed to be compact. The existence problem is then reduced to finding fixed points for the mapping Px=S ˜x+(I-V ˜)x. The implicit function theorem and classical fixed point theorems (Schauder, Krasnoselskij) are the tools used by the author in obtaining two fixed point theorems, the first of the type of contraction mapping and the second of Krasnoselskij type (for the sum of two operators). He then applies them to the generalized integral equation considered. Many known results can be derived from the Theorem 3 in this paper. Some examples are provided.

45G10Nonsingular nonlinear integral equations
47H10Fixed point theorems for nonlinear operators on topological linear spaces