If I understand it correctly Dirac developed his equation because he was looking for a relativistic first order wave equation for the electron, rather than a second-order one like the Klein-Gordon equation.(adsbygoogle = window.adsbygoogle || []).push({});

Why did he wanted a first-order equation? Is it because the probability current is not positive-definite for higher than second order equations?

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# I Why did Dirac want a first-order equation?

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