User:Caliburn/s/prob/Definition:Square-Integrable Random Variable
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Definition
Let $\struct {\Omega, \Sigma, \Pr}$ be a probability space.
Let $X$ be a real-valued random variable on $\struct {\Omega, \Sigma, \Pr}$.
We say that $X$ is square-integrable if and only if ${\size X}^2$ is integrable.