what a great "double" functional equation!
17:56
This problem is everywhere!
17:01
this limit has a dangerous solution!!
18:35
The Basel Problem
18:36
A nice functional equation from Romania
14:48
Trump Redecorates White House in ALL GOLD, Still Waiting on Epstein Files & Canadians are MAD!
19:01
X et équation fonctionnelle
18:08
a super nice functional equation
29:10