# Euler, Leonhard

**Euler, Leonhard** (1707–83) Swiss mathematician. He is best known for his geometric theorem, which states that for any polyhedron (many-sided figure), V **−** E + F = 2, where *V* is the number of vertices, *E* the number of edges, and *F* the number of faces. Euler conducted much research into the number e, the base of natural logarithms.

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# Leonhard Euler

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**Leonhard Euler**