What is it?
It is the single most beautiful equation in all of mathematics.
As this blogger points out:
It relates five of the Most Important Numbers in the World (0, 1, e, i, and ) using three of the Most Important Operations in the World (addition, multiplication, and exponentiation) and nothing else.
According to Gauss, if the truth of this equation is not immediately apparent to you, now having been shown it, you will never be a first-rate mathematician.
So that settles that.
Here’s what it means: