See more about Euler here. He is one of the greatest mathematicians ever known. Few people has a number named after him: e. That's right, the base of the natural logarithm. Your calculator has an ex button. You must be dozing in calculus or had a professor who can't speak English if you don't know what's so natural about the natural logarithm. (Yes, d/dx ex = ex) It is invincible for differentiation.
But wait there's more... that Euler formula in the lower-right corner connects e, i, π, and also 0 and 1 together. Such relationship is a beauty in the eyes of the mathematicians. I have a great book on this fabulous formula (I wish I understand all of it).
See that bridge over there in the google image? It is the Seven Bridges of Königsberg problem that opens a new chapter in math: topology.
That V - E + F = 2 is also known as Euler's formula for shapes and stuff.
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