Columbia Encyclopedia

Search results

500 results found

Bachelard, Gaston

(Encyclopedia)Bachelard, Gaston gästôNˈ bäshlärˈ [key], 1884–1962, French philosopher. He held degrees in physics, mathematics, and philosophy and taught at Dijon (1930–40) and the Univ. of Paris (1940–...

Cartan, Élie Joseph

(Encyclopedia)Cartan, Élie Joseph äNrēˈ [key], 1904–2008, was also a mathematician, and was one of the founding members of the Bourbaki group (see Bourbaki, Nicolas), which sought to establish a rigorous foun...

Russell, Bertrand Arthur William Russell, 3d Earl

(Encyclopedia)Russell, Bertrand Arthur William Russell, 3d Earl, 1872–1970, British philosopher, mathematician, and social reformer, b. Trelleck, Wales. As with his philosophical stance, Russell's positions on ...

quaternion

(Encyclopedia)quaternion kwətûrˈnēən [key], in mathematics, a type of higher complex number first suggested by Sir William R. Hamilton in 1843. A complex number is a number of the form a+bi when a and b are re...

European Bank for Reconstruction and Development

(Encyclopedia)European Bank for Reconstruction and Development (EBRD), international financial institution that invests primarily in the private sector to promote entrepreneurship and foster the development of demo...

International Bank for Reconstruction and Development

(Encyclopedia)International Bank for Reconstruction and Development (IBRD) (IBRD), independent specialized agency of the United Nations, with headquarters at Washington, D.C.; one of five closely associated develop...

Organization for Economic Cooperation and Development

(Encyclopedia)Organization for Economic Cooperation and Development (OECD), international organization that came into being in 1961. It superseded the Organization for European Economic Cooperation, which had been ...

tangent

(Encyclopedia)tangent, in mathematics. 1 In geometry, the tangent to a circle or sphere is a straight line that intersects the circle or sphere in one and only one point. For other curves and surfaces the tangent l...

engineering

(Encyclopedia)engineering, profession devoted to designing, constructing, and operating the structures, machines, and other devices of industry and everyday life. Until the Industrial Revolution there were only t...

Kepler, Johannes

(Encyclopedia)Kepler, Johannes yōhäˈnəs kĕpˈlər [key], 1571–1630, German astronomer. From his student days at the Univ. of Tübingen, he was influenced by the Copernican teachings. From 1593 to 1598 he was...