One of my favorite identities.
18:17
I really like this integral
21:46
The dilogarithm -- a favorite "special function"
26:43
can you do the hardest problem from the European Mathematical Cup??
27:42
A Wallis-type product for e.
19:06
The Trig Hiding Inside the Factorials (And Harmonic Numbers)
20:33
a quaternion version of Euler's formula
16:13
Cette règle s'avère fausse, mais pour une bonne raison
11:59