The most beautiful equation in mathematicspic.twitter.com/Oh3tvNDQHO
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I'd say 'identity' instead of 'equation'
Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function. Euler's formula states that for any real number xe{ix}=\cos x+i\sin x
Oiler : Slang for diesel engine, engineered by Rudolf Diesel
Cauchy-Euler equation 
The Seven Bridges of Königsberg problem his solution was quite elegante
Agreed. It’s now called a Euler circuit
A must read book on Euler is. A most elegant equation by David stipp
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