Leonhard Euler, pronounced like "Oiler", was born on April 15th, 1707 in Basel Switzerland and is widely considered to be the most prolific mathematician of all time.

His contributions to mathematics and physics are astounding, studying areas such as calculus, number theory, geometry, engineering, optics, astronomy, and more. 

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According to the publication, "The Mathematical Intelligencer", 3 out of the top 5 most beautiful equations are a result of Euler's work. The number one result is the famous Euler's Identity: