Why do some terms vanish in first-order perturbation theory?
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In first-order perturbation theory, we usually express the first-order perturbation in the eigenket of the perturbed Hamiltonian in the basis of the unperturbed Hamiltonian H0H0:
|b⟩ = ∑nbn|En⟩,|b⟩ = ∑nbn|En⟩,
where |b⟩|b⟩ is the first-order change in the perturbed eigenket and the |En⟩|En⟩ are the eigenkets of H0H0.
|b⟩ = ∑nbn|En⟩,|b⟩ = ∑nbn|En⟩,
where |b⟩|b⟩ is the first-order change in the perturbed eigenket and the |En⟩|En⟩ are the eigenkets of H0H0.
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Super Conductivity theory was taken or put up to prove thr ordering of the vanishment of all the particles in terms of attraction energy level. In all manner.
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