Columbia Encyclopedia

(Encyclopedia) Chuquet, Nicolas nēkôläˈ shükāˈ [key], c.1450–1500, French mathematician, probably b. Paris. Little is known of Chuquet's life. At Lyons in 1484 he composed a manuscript on the science of num...

(Encyclopedia) Fogazzaro, Antonio äntôˈnyō fōgät-tsäˈrō [key], 1842–1911, Italian novelist and poet. His first work was a verse romance, Miranda (1874). Primarily concerned with moral issues, he was parti...

(Encyclopedia) program trading, a form of securities trading, also known as index arbitrage. Program traders exploit the price discrepancies between indexes of stocks and futures contracts by using sophisticated com...

(Encyclopedia) value, in colorimetry: see color.

(Encyclopedia) Still, Clyfford, 1904–80, American painter, b. Grandin, N.Dak. A brilliant painter, he was one of the founders of abstract expressionism, although never one of the style's best-known practitioners. ...

(Encyclopedia) tanzanite tănzănˈīt [key], beautiful gemstone discovered in 1967 in the Umba Valley near the Usambara Mts. in Tanzania, a precious variety of the mineral zoisite, a calcium aluminum silicate. Zois...

(Encyclopedia) Rosmini-Serbati, Antonio äntōˈnyō rōzmēˈnē-sĕrbäˈtē [key], 1797–1855, Italian theologian. Ordained a priest in 1821, he attempted to establish a philosophical system based on Roman Catho...

(Encyclopedia) Gesner, Konrad von kônˈrät fən gĕsˈnər [key], 1516–65, Swiss scientist and bibliographer. Gesner was noted for his scholarship and erudition in almost every field of knowledge. He lived in Z�...

(Encyclopedia) Goldmark, Peter Carl, 1906–77, Hungarian-American engineer, b. Budapest. He studied at the Univ. of Vienna (B.S., 1929, Ph.D., 1931); worked for a radio company in England (1931–33). After emigrat...

(Encyclopedia) turquoise, hydrous phosphate of aluminum and copper, Al2(OH)3PO4·H2O+Cu, used as a gem. It occurs rarely in crystal form, but is usually cryptocrystalline. Turquoise is opaque and has a waxy luster; ...