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Natural SciencesMathematicsDynamical SystemsOptimizationGlobal OptimizationPerturbation MethodsPerturbation TheorySingular Perturbation TheoryVariational FormulationVariational InequalitiesExistence Of MinimizersMatrix Perturbation TheorySingular Perturbation AnalysisSingular Perturbations In OptimizationSingularly Perturbed Initial Value Problems