i factorial, do you factorial?

Pi & Gamma function, extending the factorial, https://youtu.be/L4Trz6pFut4

Euler's Formula, deal with complex exponent, https://youtu.be/jF1Qv8KyZ1Q
Euler's Formula in Chinese (中文版), https://youtu.be/SLjabgzKFBM

sqrt(2)! https://youtu.be/ziLgaIyb_Sk

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