Let P and Q be two probability measures on the same measurable space (, F) and let

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Let P and Q be two probability measures on the same measurable space (Ω, F) and let f = dQ/dP denote the Radon–Nikodym derivative of Q with respect to P. Show that

EQ[X|G] = Ep[Xf|G] Ep[f|G]

where G is a sub-sigma-algebra of F and X is a measurable random variable. This formula is considered as a generalization of the Bayes Rule.  

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