Jan 1, 1874 — Jan 1, 1954· 80 yrs
UNITED STATES AUTHOR · NUMBER THEORY · GROUP THEORY
Leonard E. Dickson
Also known as: Leonard Eugene Dickson, Leonard E. 1874 Dickson
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Wikipedia 1. THE word Trigonometry is derived from two Greek words, one signifying a triangle and the other signifying I measure, and originally denoted the science in which the relations subsisting between the sides and the angles of a triangle were investigated; the science was called plane trigonometry, or spherical trigonometry, according as the triangle was formed on a plane surface or on a spherical surface.
— from Plane trigonometry, 1856
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