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If you multiply the Dirac Equation by its complex conjugate, you recover the Klein-Gordon Equation. This is what we mean when we say that the Dirac Equation is the "square root" of the Klein Gordon Equation. In fact, this is how the Dirac Equation was found!pic.twitter.com/dg1WYzAGAk
Yes! Great stuff .. I love seeing that to make the KG equation linear you need to have non-commuting numbers .. the smallest dimension that admits linearization is n=4
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