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Nitpick: 0! = 1. Any value less than 0 is defined by the Gamma function.
– Makoto
Commented Feb 28, 2013 at 6:11
As is any non-integer value, but neither is used very often for programming purposes (unless you're working on a math-related project).
– Stjepan Bakrac
Commented Feb 28, 2013 at 6:14
Ok, I added some examples with the type of data structure I am learning about.
– Mat.S
Commented Feb 28, 2013 at 6:16
According to this discussion on MathOverflow, there is "no 'good' answer" for negative factorial. I had never really thought about negative factorials so I will express no opinion, but I thought this was interesting. mathoverflow.net/questions/10124/the-factorial-of-1-2-3
– steveha
Commented Feb 28, 2013 at 6:22

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