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Different forms of the zeroth-order Hamiltonian in second-order perturbation theory with a complete active space self-consistent field reference function

Spectral TheoryHamiltonian TheoryEngineeringSecond-order Perturbation TheoryPhysicsZeroth-order HamiltonianSingularly Perturbed ProblemPerturbation MethodDifferent FormsGeometric Singular Perturbation TheoryFunctional AnalysisHamiltonian System