Let ((X, mathscr{A}, mu)) be a finite measure space and let (u in mathcal{L}^{1}(mu)) be strictly positive
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Let \((X, \mathscr{A}, \mu)\) be a finite measure space and let \(u \in \mathcal{L}^{1}(\mu)\) be strictly positive with \(\int u d \mu=1\). Show that
\[\int(\log u) d \mu \leqslant \mu(X) \log \left(\frac{1}{\mu(X)}ight)\]
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