Columbia Encyclopedia

Search results

410 results found

differential geometry

(Encyclopedia)differential geometry, branch of geometry in which the concepts of the calculus are applied to curves, surfaces, and other geometric entities. The approach in classical differential geometry involves ...

muon

(Encyclopedia)muon myo͞oˈŏn [key], elementary particle heavier than an electron but lighter than other particles having nonzero rest mass. The name muon is derived from mu meson, the former name of the particle....

planetarium

(Encyclopedia)planetarium, optical device used to project a representation of the heavens onto a domed ceiling; the term also designates the building that houses such a device. A modern planetarium consists of as m...

psychotherapy

(Encyclopedia)psychotherapy, treatment of mental and emotional disorders using psychological methods. Psychotherapy, thus, does not include physiological interventions, such as drug therapy or electroconvulsive the...

Baden, former state, Germany

(Encyclopedia)Baden bäˈdən [key], former state, SW Germany. Karlsruhe was the capital. Stretching from the Main River in the northeast across the lower Neckar valley and along the right bank of the Rhine to Lake...

meson

(Encyclopedia)meson mēˈzŏn [key] [Gr.,=middle (i.e., middleweight)], class of elementary particles whose masses are generally between those of the lepton class of lighter particles and those of the baryon class ...

Watertown

(Encyclopedia)Watertown. 1 Town (1990 pop. 20,456), Litchfield co., W Conn.; set off from Waterbury and inc. 1780. Textiles, plastics, chemicals, mattresses, and brass goods are among its manufactures. A method for...

Dia Art Foundation

(Encyclopedia)Dia Art Foundation, American foundation that supports contemporary art and artists, est. 1974 by art dealer Heiner Friedrich and his wife, art patron Philippa de Menil. The foundation, which commissio...

Heine, Heinrich

(Encyclopedia)Heine, Heinrich hīnˈrĭkh hīˈnə [key], 1797–1856, German poet, b. Düsseldorf, of a Jewish family. One of the greatest of German lyric poets, he had a varied career. After failing in business h...

Popper, Sir Karl Raimund

(Encyclopedia)Popper, Sir Karl Raimund, 1902–94, Anglo-Austrian philosopher, b. Vienna. He became familiar with the Vienna circle of logical positivists (see logical positivism) while a student at the Univ. of Vi...