7:40

Methods of Functional Equations

9:57

Olympiad Algebra

11:26

Solving the hardest question of a British Mathematical Olympiad

14:15

Functional Equation

20:10

Where did this come from?

15:48

x^y = y^(x-y)

14:11

A Diophantine Equation @dhdkro

12:13

Integral of 1/x^4 ( Complex valued)