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Definition

Probability Space

Stochastic Calculus · bm.tex
A probability space is a triple $(\Omega, \mathcal{F}, \mathbb{P})$ where:
  1. $(\Omega, \mathcal{F})$ is a measurable space (Definition~Sigma-Algebra), with $\Omega$ the sample space.
  2. $\mathbb{P} : \mathcal{F} \to [0,1]$ is a probability measure: $\mathbb{P}(\Omega) = 1$, and for pairwise disjoint $A_1, A_2, \ldots \in \mathcal{F}$, \[ \mathbb{P}\!\left(\bigcup_{n=1}^\infty A_n\right) = \sum_{n=1}^\infty \mathbb{P}(A_n). \]
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