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Definition

Measure Space

Stochastic Calculus · bm.tex
A measure space is a triple $(\Omega, \mathcal{F}, \mu)$ where $(\Omega, \mathcal{F})$ is a measurable space (Definition~Sigma-Algebra) and $\mu : \mathcal{F} \to [0, \infty]$ satisfies $\mu(\emptyset) = 0$ and countable additivity. It is $\sigma$-finite if $\Omega = \bigcup_{n=1}^\infty A_n$ with $\mu(A_n) < \infty$ for each $n$. A probability space (Definition~Probability Space) is a measure space with $\mu(\Omega) = 1$.
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