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Hello there.

This is Numberphile. We mainly post videos about mathematics and just numbers in general.

Zero Factorial

Zero Factorial

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!

Transcendental Numbers

Transcendental Numbers

Number Trick

Number Trick