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## Main Question or Discussion Point

I am interested in the derivation of Schrödinger’s wave equation from the Klein Gordon equation. I have looked in Penfold’s ‘The Road to Reality’, the open University’s Quantum Mechanics books, Feynman’s lectures, the internet, but not found what I want. Everyone seems to take it as a given, or work back to it from quantum theory. Presumably at least in the early days people looked at how to justify the equation.

I think I have succeeded in constructing a derivation, but I would like to check my work. I think the derivation gives insights that are not obvious in the equation fait accompli. Can anyone point me at an ‘approved’ derivation?

I think I have succeeded in constructing a derivation, but I would like to check my work. I think the derivation gives insights that are not obvious in the equation fait accompli. Can anyone point me at an ‘approved’ derivation?