Leonhard Euler(15 April 1707 – 18 September 1783) was a pioneering Swiss mathematician and physicist.
He made important discoveries in fields as diverse as infinitesimal calculus and graph 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 renowned for his work in mechanics, fluid dynamics, optics, and astronomy.
He is considered to be the preeminent mathematician of the 18th century, and one of the greatest mathematicians to have ever lived.
Euler is the only mathematician to have two numbers named after him: the immensely important Euler's Number in calculus, e, approximately equal to 2.71828, and the Euler-Mascheroni Constant γ (gamma) sometimes referred to as just "Euler's constant", approximately equal to 0.57721. It is not known whether γ is rational or irrational.
Euler is well known in analysis for his frequent use and development of power series, the expression of functions as sums of infinitely many terms, such as
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| A geometric interpretation of Euler's formula |
Honours:
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| 1957 stamp of the former Soviet Union commemorating the 250th birthday of Euler. The text says: 250 years from the birth of the great mathematician, academician Leonhard Euler. |
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| Old Swiss 10 Franc banknote honoring Euler |
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| Stamp of the former German Democratic Republic honoring Euler on the 200th anniversary of his death. Across the centre it shows his polyhedral formula, nowadays written as v − e + f = 2. |
Source: Wikipedia
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