Zero Factorial

Alex Bellos discusses how the Incans used knots in string (Quipu) to record numbers.Check out Brilliant (get 20% off their premium service): https://brillian...

0! = 1

Dr James Grime tries to explain why this is the case - follow James on Twitter at https://twitter.com/jamesgrime

Regarding the equation at the end - James says it should be e^-t dt NOT e^-n dn ... sorry for the mix-up!