Introduction to the Gamma function & the Pi function (extending the factorial!)
10:53
what is half factorial? (1/2)!=? via. Gamma function
26:31
How to Take the Factorial of Any Number
22:27
a spectacular solution to the Basel problem (sum of 1/n^2 via a complex integral)
8:15
The Dirichlet Integral is destroyed by Feynman's Trick
12:58
zero factorial, why 0! should be 1, 4 reasons
4:55
What Is The Factorial Of 1/2? SURPRISING (1/2)! = (√π)/2
16:20
How to use the error function for some tough integral
19:44