In mathematics, Euler's iden.y also known as Euler's equation is the equality + = where e is Euler's number, the base of natural logarithms, i is the imaginary unit, which satisfies i 2 = 1, and is pi, the ratio of the cir.ference of a circle to its diameter Euler's iden.y is named after the Swiss mathematician Leonhard Euler.It is considered to be an example of mathematical .The Euler formula, sometimes alsoed the Euler iden.y e.g., Trott 2004, p. 174 , states e^ ix =cosx+isinx, 1 where i is the imaginary unit. Note that Euler's polyhedral formula is sometimes alsoed the Euler formula, as is the Euler curvature formula. The equivalent expression ix=ln cosx+isinx 2 had previously been published by Cotes 1714 ..Leonhard Euler / l r / OYlr; German: listen ;  was a Swiss mathematician, physicist, astronomer, logician and engineer, who made important and influential discoveries in manynches of mathematics, such as infinitesimal calculus and graph theory, while also making pioneering contributions to severalnches such as topology andytic .The Euler Archive is an online resource for Leonhard Euler's original works and modern Euler scholarship. This dynamic li.ry and database provides access to original publications, and references to available translations and current research..
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