Zero Factorial - Numberphile

0! = 1 Dr James Grime tries to explain why this is the case - follow James on Twitter at   / jamesgrime   More links & stuff in full description below ↓↓↓ Regarding the equation at the end - James says it should be e^-t dt NOT e^-n dn ... sorry for the mix-up! NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook:   / numberphile   Numberphile tweets:   / numberphile   Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Patreon:   / numberphile   Brady's videos subreddit:   / bradyharan   Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9 Numberphile T-Shirts: https://teespring.com/stores/numberphile Other merchandise: https://store.dftba.com/collections/n...