Logarithm of Beta Function is Convex on Positive Reals
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Theorem
Let $x, y \in \R$ be real numbers.
Let $\map \Beta {x, y}$ be the Beta function:
- $\ds \map \Beta {x, y} := \int_{\mathop \to 0}^{\mathop \to 1} t^{x - 1} \paren {1 - t}^{y - 1} \rd t$
Let $y \in \R_{>0}$ be given.
Then $\map \ln {\map \Beta {x, y} }$ is a convex function of $x$ on $\R_{>0}$.
Proof
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Sources
- 1977: K.G. Binmore: Mathematical Analysis: A Straightforward Approach ... (previous) ... (next): $\S 17.7 \ (4)$