Fatou's Lemma - Reverse Fatou Lemma

Reverse Fatou Lemma

Let f1, f2, . . . be a sequence of extended real-valued measurable functions defined on a measure space (S,Σ,μ). If there exists an integrable function g on S such that fn ≤ g for all n, then

\limsup_{n\to\infty}\int_S f_n\,d\mu\leq\int_S\limsup_{n\to\infty}f_n\,d\mu.

Note: Here g integrable means that g is measurable and that .

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