Can we have negative factorial?

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We will figure out if we can do the factorial of -1/2 and the factorial of -1. We will be using the extension of factorial via the Pi function and the Gamma function. I will also give a summary at the end on when we can have negative factorials.

Pi & Gamma functions: extending the factorial (the Gamma fu...
0^0 convention: 0^0=1 is "seriesly" useful! ,
negative factorial, Can we have negative factorial?

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