# Leonhard Euler

**Leonhard Euler** (pronounced OY luhr) was a Swiss mathematician who lived
between 1707 and 1783. Euler was born in Basel, Switzerland and was famous for
his exceptional output of original mathematics covering a wide range of subjects.
His output even increased after he became blind in 1766.

Besides his many contributions to number theory, Euler made significant contributions to the areas of calculus, geometry, algebra, probability, acoustics, optics, mechanics, astronomy, artillery, navigation, statistics, and finance.

**See Also:** Gamma, EulersTheorem

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