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ring, mathematical system

(Encyclopedia)ring, in mathematics, system consisting of a set R of elements and two binary operations, such that addition makes R a commutative group and multiplication is associative and distributes over addition...

parabola

(Encyclopedia)CE5 Parabola parabola pərăbˈələ [key], plane curve consisting of all points equidistant from a given fixed point (focus) and a given fixed line (directrix) (see illustration). It is the conic...

Walpole, Sir Hugh Seymour

(Encyclopedia)Walpole, Sir Hugh Seymour, 1884–1941, English novelist, b. New Zealand, educated at Cambridge. His first two novels were failures, but with Fortitude (1913) he achieved financial and literary succes...

casein

(Encyclopedia)casein kāˈsēn [key], well-defined group of proteins found in milk, constituting about 80% of the proteins in cow's milk, but only 40% in human milk. Casein is a remarkably efficient nutrient, suppl...

Tetley, Glen

(Encyclopedia)Tetley, Glen (Glenford Andrew Tetley, Jr.), 1926–2006, American dancer and choreographer, b. Cleveland. He studied in New York City with Hanya Holm and trained with Martha Graham, subsequently danci...

Stewart, Dugald

(Encyclopedia)Stewart, Dugald, 1753–1828, Scottish philosopher. He studied at the Univ. of Edinburgh, later becoming professor of mathematics (1775–85) and of moral philosophy (1785–1810). After retiring he d...

baud

(Encyclopedia)baud bôd, bōd [key], measure of the rate at which signals are transmitted over a telecommunications link. It is equivalent to the number of elements or pulses transmitted in one second, e.g., in com...

Bruno, Giordano

(Encyclopedia)Bruno, Giordano jōrdäˈnō bro͞oˈnō [key], 1548–1600, Italian philosopher, b. Nola. The son of a professional soldier, he entered the Dominican order early in his youth and was ordained a pries...

Meléndez, Luis

(Encyclopedia)Meléndez, Luis lo͞oēsˈ mālānˈdāth [key], 1716–80, Spanish painter. He assisted his father, artist Francisco Melendez, until 1737, when he began studying with Lewis-Michel Vanloo, the court p...

Ma Yüan

(Encyclopedia)Ma Yüan mä yüän [key], fl. c.1190–1225, Chinese painter of the Sung dynasty and foremost of the Ma family of painters. He became one of the most important landscape painters of the 12th and 13th...