an IMO functional equation.
15:34
One of the coolest functional equations I have seen!
18:15
an absolutely surprising final solution to this functional equation.
36:01
from the IMO shortlist...
31:10
the geometry of the third derivative
18:36
A nice functional equation from Romania
19:57
the most outlandish technique is used to solve this...
17:37
Japanese Mathematical Olympiad | 2004 Q2
30:59