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Time dependent perturbation theory

      https://doi.org/10.1142/9789814374392_0013Cited by:0 (Source: Crossref)
      Abstract:

      Let us consider a system whose Hamiltonian H0 is time independent and let us assume that we know how to solve for its eigenvalues and eigenfunctions exactly. We know that the eigenstates, in this case, will be stationary states.