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单词 BohrMollerupTheorem
释义

Bohr-Mollerup theorem


Let f:++ be a functionMathworldPlanetmath with the following properties:

  1. 1.

    logf(x) is a convex function (i.e. f is logarithmically convex);

  2. 2.

    f(x+1)=xf(x) for all x>0;

  3. 3.

    f(1)=1.

Then f(x)=Γ(x) for all x>0.
That is, the only function satisfying those properties is the gamma functionDlmfDlmfMathworldPlanetmath (restricted to the positive reals.)

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更新时间:2025/5/4 11:37:07