Imaginary numbers as a two-dimensional number system
Welch Labs · Course · YouTube title: Imaginary Numbers Are Real [Part 1: Introduction]
Why it's here
HN commenters rate the series as some of the best visual teaching on complex numbers and recommend it for building intuition.
What it covers
The first part of Welch Labs' series on imaginary numbers, presenting them as the natural extension of the number line into two dimensions. It covers the history and the math with strong visuals.