**Fact 1**

Leonhard Euler was born in Basel on 15 April 1707 and died on 18 September 1783.**Fact 2**

He made essential discoveries in different fields like infinitesimal calculus and graph theory.**Fact 3**

Leonhard Euler also presented a lot of the modern mathematical terminology and notation, mainly for mathematical analysis, such as the idea of a mathematical function.**Fact 4**

He is famous for his work in fluid dynamics, mechanics, optics and astronomy.**Fact 5**

Leonhard Euler is known as the pre-eminent mathematician of the 18th century and one of the best mathematicians to have ever lived.**Fact 6**

He is also one of the most creative mathematicians and his collected works if combined can fill up to 60 to 80 quarto volumes.**Fact 7**

Euler's eyesight deteriorated through his mathematical career. 3 years after a near-fatal fever in 1735, he became almost blind in the right eye,**Fact 8**

He introduced the idea of a function and was the first to write f(x) to represent the function ‘f’ applied to the argument ‘x’. He also initiated the modern representation of the trigonometric functions.**Fact 9**

Leonhard Euler is also recognized for using closed curves to demonstrate syllogistic reasoning (1768). These illustrations are known as Euler diagrams.**Fact 10**

Euler was presented on the sixth series of the Swiss 10 franc banknote and on many Swiss, German, and Russian postage stamps. The asteroid 2002 Euler is also named in his honor.

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