This Equation Changed Functional Equations Forever
4:24
The easiest problem on IMO training camp
18:15
an absolutely surprising final solution to this functional equation.
21:23
Cauchy's Functional Equations (part1: The Additive One)
30:15
The Math of "The Trillion Dollar Equation"
6:23
The Cauchy Functional Equation
8:33
A Functional Equation from British Math Olympiads 2009
17:42
Multiplicative Functional Equation
16:34