21:24

A long road to the limit

17:08

Solving a Quartic Equation

21:39

a * b = ab + a + b

12:59

7 factorials you probably didn't know

16:24

Evaluating a series of factorials

8:49

A Factorial Equation With Integers

17:08

n^4 + 3n^2 + 2 is never a perfect square

16:43

A Vieta Problem