a fun functional equation
18:42
a nice functional equation.
13:38
what a great "double" functional equation!
13:24
An interesting infinite sum
9:10
Quadratic formula for non-constant coefficients
11:25
a nice functional equation
16:34
Deriving the Dirac Equation
12:59
if x+y=8, find the max of x^y (Lambert W function)
26:43