zero factorial, why 0! should be 1, 4 reasons

why 0! should be 1,

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In this video, I give 4 of my reasons on why we should have 0! to be 1. For the first reason, be sure you know the difference that I am not using the usual definition of n! to "prove" that 0! =1. I am saying that 0! should be 1 so that the pattern will still work.

Pi & Gamma functions:    • Introduction to the Gamma function & ...  
0^0 convention:    • 0^0=1 is "seriesly" useful!   ,
negative factorial,    • Can we have negative factorial?  

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math for fun,
zero factorial,
factoreo,