Pi is irrational (π∉ℚ)
24:20
Too hard for the IMO? Too easy?
28:47
So many factorials!!!
11:03
How do we know π is infinite and never repeats? Proving pi is irrational #PiDay
27:26
e is transcendental -- the best proof!
19:10
Pi is IRRATIONAL: simplest proof on toughest test
23:20
Pi is IRRATIONAL: animation of a gorgeous proof
21:21
A nice integral.
26:14