# 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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Johann Tobias Mayer , Euler, Leonhard
Euler, Leonhard
mathematics, mechanics, astronomy, physics.
Life . Euler’s forebears settled in Basel at the end of the sixteenth cen… Paul Erdos , Erdös, Paul (Pál)
ERDöS, PAUL (PáL)
Erdös was a Hungarian mathematician who spent much of his life traveling and working with colleagues around the w… David Hilbert , Hilbert, David
Hilbert, David
(b. Königsberg, Germany [now Kaliningrad, R.S.F.S.R.], 23 January 1862; d. Göttingen, Germany, 14 February 1943)
mathem… Leopold Kronecker , mathematics.
Kronecker’s parents were Isidor Kronecker, a businessman, and his wife, Johanna Prausnitzer. They were wealthy and provided private tuto… James Joseph Sylvester , Sylvester, James Joseph
SYLVESTER, JAMES JOSEPH
mathematics.
Although Sylvester is perhaps most widely remembered for his indefatigable work in the t… Srinivasa Ramanujan Aiyangar , Ramanujan, Srinivasa Aaiyangar
RAMANUJAN, SRINIVASA AAIYANGAR
(b Erode, near Kumbakonam, Tanjore district, Madras province, India, 22 December 1887;…

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**Leonhard Euler**