A radical equation.

A fun functional equation!!

Two from Thailand!

Kepler’s Impossible Equation

Solving the hardest question of a British Mathematical Olympiad

Innocent looking, but ????

The Oldest Unsolved Problem in Math

How To Count Past Infinity

The smallest such prime...

The most beautiful equation in math, explained visually [Euler’s Formula]

A very interesting differential equation.

Too hard for the IMO? Too easy?

The Simplest Math Problem No One Can Solve - Collatz Conjecture

How Imaginary Numbers Were Invented

The hardest problem on the hardest test

A Fun One from the Vietnamese IMO

Which is larger??

The rarest move in chess

A Fun One from the British Maths Olympiad

The World's Best Mathematician (*) - Numberphile

A viewer suggested problem!