Euler, Leonhard
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Euler, Leonhard
Swiss mathematician. He developed the theory of differential equations and the calculus of variations, and worked in astronomy and optics. He also enlarged mathematical notation.
Euler developed spherical trigonometry and demonstrated the significance of the coefficients of trigonometric expansions; Euler's number (e, as it is now called) has various useful theoretical properties and is used in the summation of particular series.
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