Equation which is related with the Lorentz invariant quantities

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Dhmht_Kr
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Hi every one.How can i prove the below equation?
Equation: integral of d^3p/(2E) equals integral of d^4p times delta(p^mu p_mu - m^2) times theta(p^0).

And then that it's Lorentz invariant quantitude ?
Thanks for your help
 

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