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Existence for a class of semilinear problems at resonance. (English) Zbl 0515.34003

MSC:
34A12 Initial value problems, existence, uniqueness, continuous dependence and continuation of solutions to ordinary differential equations
34A34 Nonlinear ordinary differential equations and systems, general theory
47B38 Linear operators on function spaces (general)
34C25 Periodic solutions to ordinary differential equations
34K99 Functional-differential equations (including equations with delayed, advanced or state-dependent argument)
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