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An implementation of the coupled perturbed Kohn-Sham equations: perturbation due to nuclear displacements

Numerical AnalysisNumerical Method For Partial Differential EquationPerturbation MethodPhysicsSingularly Perturbed ProblemKohn-sham EquationsGeometric Singular Perturbation TheoryNonlinear Hyperbolic ProblemNuclear Displacements