# The Creation and Importance of Imaginary Numbers in Mathematics

TLDR Imaginary numbers, which were discovered as a solution to the problem of finding the square root of a negative number, have become a core part of mathematics. Represented by the square root of negative one, imaginary numbers are used in various mathematical operations and have practical applications in fields such as science and engineering.

### Timestamped Summary

00:00
The resolution of a problem in mathematics led to the creation of imaginary numbers.

01:37
Dividing by zero is impossible and doesn't make sense, while the factorial of zero is equal to one.

03:07
Mathematicians define zero factorial as one because it is necessary for the factorial of any number to be equal to that number times the factorial of the number before it.

04:41
The problem of finding the square root of a negative number has been encountered by mathematicians throughout history, and different solutions have been proposed, such as ignoring negative square roots altogether.

06:11
Imaginary numbers, represented by the square root of negative one, were discovered to be necessary in solving real problems and were further explored by mathematicians such as Leonhard Euler and Caspar Wessel.

07:47
Complex numbers, represented by a plane with a real part and an imaginary part, have become a core part of mathematics and are used in various mathematical operations.

09:20
Complex numbers are important in fields of science and engineering, particularly in the study of waves and their practical applications in various technologies such as radios, Wi-Fi, sound, fiber optics, GPS, and MRI machines.