Norm of the four-momentum: $\langle \mathbf P,\mathbf P\rangle = (E/c)^2 - p^2 = (mc)^2$ · Prove2Me

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Norm of the four-momentum: $\langle \mathbf P,\mathbf P\rangle = (E/c)^2 - p^2 = (mc)^2$ · Prove2Me