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I'm reading Griffiths' book and when it claims the first two components of plane wave solution to massive Dirac equation as electron and the “holes” of other two components as positron, it does not seem natural to me... Am I missing some crucial idea?

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  • $\begingroup$ It applies to any fermionic field, including electrons. $\endgroup$ – Alexander Apr 19 '18 at 13:33
  • $\begingroup$ But not to photons. $\endgroup$ – Lewis Miller Apr 19 '18 at 14:05
  • $\begingroup$ Google Dirac hole theory for an explanation. $\endgroup$ – Lewis Miller Apr 19 '18 at 14:07

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