Monotone Convergence Theorem

Monotone Convergence Theorem

Theorem

Suppose $\{f_{n}\}$ is a sequence of non-negative measurable functions, $f_{n}:X\to [0,+\infty ]$ such that $f_{n-1}\leq f_{n}$ for all $n$. Furthermore, $\lim _{n\to +\infty }f_{n}=f(=\sup _{n}f_{n})$. Then

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