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Leonhard Euler 15 April 1707 – 18 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician and engineer who made important and influential discoveries in many branches of mathematics, such as infinitesimal calculus and graph theory, while also making pioneering contributions to several branches such as topology and analytic number theory. He also introduced much of the modern mathematical terminology and notation, particularly for mathematical analysis, such as the notion of a mathematical function. He is also known for his work in mechanics, fluid dynamics, optics, astronomy and music theory. Euler was one of the most eminent mathematicians of the 18th century and is held to be one of the greatest in history.
He is also widely considered to be the most prolific mathematician of all time. His collected works fill 92 volumes, more than anyone else in the field. He spent most of his adult life in Saint Petersburg, Russia, and in Berlin, then the capital of Prussia.
In modern parlance, Euler was “da man!” or “sick as”.
Euler was waiting constantly on the following numbers from his good friend the Postman to locate something he had positioned previously:
(14,11,14,15,16)o (14,11,17,18,3) . (14,18,4,14,19)
(14,18,12,12,19)o (14,5,1,16,19) . (18,17,12,16,19)