a very tricky Diophantine equation
11:31
two nice math problems
21:16
The most interesting differential equation you have seen.
9:23
I want a simple life, but WolframAlpha doesn't allow it!
26:43
can you do the hardest problem from the European Mathematical Cup??
17:26
Researchers thought this was a bug (Borwein integrals)
16:47
proving the power rule for any exponent!!
33:01
The Man Who Almost Broke Math (And Himself...)
19:30