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A modified BFGS method and its global convergence in nonconvex minimization

Numerical AnalysisMathematical ProgrammingNonconvex MinimizationGlobal ConvergenceEngineeringContinuous OptimizationPde-constrained OptimizationComputer EngineeringDerivative-free OptimizationInverse ProblemsModified Bfgs MethodUnconstrained OptimizationNondifferentiable OptimizationApproximation Theory