Definition:Measurable Function/Real-Valued Function/Definition 1
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Definition
Let $\struct {X, \Sigma}$ be a measurable space.
Let $E \in \Sigma$.
Then a function $f: E \to \R$ is said to be $\Sigma$-measurable on $E$ if and only if:
- $\forall \alpha \in \R: \set {x \in E: \map f x \le \alpha} \in \Sigma$