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## Main Question or Discussion Point

Can anybody explain what Griffiths means when he talks about "good eigenstates" in degenerate time-independent purturbation theory?

Mathematically, I know he is just talking about the eigen-vectors of the W matrix (where Wij = <pis_i|H'|psi_j>). But what do the eigen-vectors physically represent? Are they the 1st order approximations of the of the new eigen-states of H = H0 + H'?

Mathematically, I know he is just talking about the eigen-vectors of the W matrix (where Wij = <pis_i|H'|psi_j>). But what do the eigen-vectors physically represent? Are they the 1st order approximations of the of the new eigen-states of H = H0 + H'?