Convergence result of a UI martingale

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enter image description here enter image description here enter image description here This Lemma is from Ethier and Kurtz's Markov Processes on page 205. My question is about the equation (5.47). I can prove it is a uniformly integrable martingale (bounded by 1), so converges to a martingale a.s. and in $L^2$. But how to get the formula of the RHS of (5.47)? Thanks very much!