olemus
naturaalarvude 1, 2, 3, ... , n korrutis, kusjuures 0! =1
=
the product of an integer and all the integers below it

tähis: n!

ülevaateid
https://slideplayer.com/slide/13199379/

https://en.wikipedia.org/wiki/Factorial

http://mathworld.wolfram.com/Factorial.html

https://functions.wolfram.com/introductions/PDF/Factorial.pdf

http://www.nntdm.net/papers/nntdm-19/NNTDM-19-2-30_42.pdf