What is pi factorial?

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Anybody here know how to calculate pi factorial? Pi isn't an integer, or a rational number, so I don't know how to do it. Can anyone please tell me what it equals to?

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You can use the gamma function which is a generalization of the factorial. Search for $\Gamma(z)$ . Check this link for your calculation. http://m.wolframalpha.com/input/?i=gamma%28pi%29&x=0&y=0