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Results tagged with functional-calculus
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user 36721
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Variational problem: how to minimise the second moment?
Let $X$ be a positive random variable (r.v.) with probability density function $f$. By the Cauchi--Schwarz inequality, $x_1^2=(EX)^2$ is a lower bound on $x_2=EX^2$, and this lower bound is attained i …
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