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The greatest mathematician of the eighteenth century,Leaonhard Euler was born in Basil Switzerland. There, he studied under another giant of mathematics, Jean Bernoulli.In 1731 Euler became a professor of physics and mathematics at St. Petersburg Academy of Sciences. Euler was the most prolific mathematician of all time, publishing over 800 different books and papers. His influence was felt in physics and astronomy as well . Euler's work on mathematical analysis, Introductio in analysis infinitorum (1748) remained a standard textbook for well over a century. For the princess of Ahaul-Dessau he wrote Letters à une princesse d'Allemagne (1768-1772), giving a clear non-technical outline of the main physical theories of the time.
One can hardly write mathematical equations without copying Euler. Notations will in use today, such as e and n, were developed by Euler. He is perhaps best known for his research into mathematical analysis. Euler's formula:
cos(x) + isin(x) = 
(ix)
Leonhard Euler died in 1783, leaving behind a legacy perhaps unmatched, and certainly unsurpassed, in the annals of mathematics.