Leonhard Euler was an influential Swiss mathematician, physicist, and engineer, born on April 15, 1707, and passed away on September 17, 1783. He made significant contributions to a wide variety of areas in mathematics, including calculus, graph theory, topology, mechanics, fluid dynamics, number theory, astronomy, and music theory. Euler is known for his prolific output, having published over 800 works during his lifetime.
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Leonhard Euler (1707–1783) developed analysis as a working language for mechanics, geometry and number theory. His 1736–1737 treatment of Newtonian mechanics put motion into the methods of differential equations, while his work on surfaces and polyhedra connected geometric quantities with structural relations such as the Euler characteristic.[ref]
https://mathshistory.st-andrews.ac.uk/Biographies/Euler/. University of St Andrews, MacTutor biography, discussion of Mechanica and contributions to differential geometry and polyhedra
The Euler's formula exemplifies the resulting unity: the complex exponential describes rotation, so oscillations can be manipulated through multiplication and differentiation. The Euler characteristic of a convex polyhedron, , concerns a different invariant altogether. Distinguishing these meanings makes his many eponyms useful connections rather than interchangeable formulas.
Portrait of Leonhard Euler
. Jakob Emanuel Handmann, 1753; Kunstmuseum Basel, inventory 276; reproduction cropped from Euler-2007 document. Public domain (life-plus-100, pre-1931 U.S. publication) and faithful reproduction / PD-Art. Source and usage information on the linked Wikimedia file page. Source.