Bohr-mollerup Theorem

In mathematical analysis, the Bohr-Mollerup theorem is named after the Danish mathematicians Harald Bohr and Johannes Mollerup, who proved it. The theorem characterizes the gamma function, defined for x > 0 by
\Gamma(x)=\int_0^\infty t^{x-1} e^{-t}\,dt
as the only function f on the interval x > 0 that simultaneously has the three properties
  • f(1)=1, and
  • f(x+1)=xf(x)\ \mbox{for}\ x>0, and
  • \log f is a convex function.
That log f is convex is often expressed by saying that f is log-convex, i.e., a log-convex function is one whose logarithm is convex.

External link

Proof, at PlanetMath

 

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