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I've find ( Weinberg: one particle state ) this :

.. functions of p^mu that are invariant by orthocronous lorentz transformation are square p^2 and ( for p^2 <=0 ) the sign of p^0 ...

for the square it's ok, but I don't understand why the sign of p^0 is "invariant" !! and is it realy a "function" of p^mu ??

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# Orthochronous lorentz transf.

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