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curve

(Encyclopedia)curve, in mathematics, a line no part of which is straight; more generally, it is considered to be any one-dimensional collection of points, thus including the straight line as a special kind of curve...

Abdul-Jabbar, Kareem

(Encyclopedia)Abdul-Jabbar, Kareem kərēmˈ ăbˈdo͝ol jəbärˈ [key], 1947–, American basketball player, b. New York City as Ferdinand Lewis (Lew) Alcindor. At 7 ft 2 in. (218 cm), he led the Univ. of Califor...

Trojan asteroids

(Encyclopedia)Trojan asteroids, asteroids that revolve about the sun in the same orbit as a planet, occupying stable positions (known as Lagrangian points) either about 60° ahead of the planet in the orbit or abou...

prospecting

(Encyclopedia)prospecting, search for mineral deposits suitable for mining. Modern prospecting has replaced earlier methods based on chance or superstition (e.g., use of the divining rod) with others based on a sci...

hurling

(Encyclopedia)hurling, outdoor ball and stick game similar to field hockey (see hockey, field). The national pastime of Ireland, it was played for many centuries before the Gaelic Athletic Association standardized ...

Hanover, city, Germany

(Encyclopedia)Hanover, Ger. Hannover, city, capital of Lower Saxony, N Germany, on the Leine River and the Midland Canal. It is a major industrial, commercial, ...

Kelsey, Henry

(Encyclopedia)Kelsey, Henry kĕlˈsē [key], c.1670–1729, English fur trader and explorer in Canada. He entered the service of the Hudson's Bay Company in 1684. He was sent (1689) inland to secure trade with abor...

arc, in electricity

(Encyclopedia)arc, in electricity, highly luminous and intensely hot discharge of electricity between two electrodes. The arc was discovered early in the 19th cent. by the English scientist Sir Humphry Davy, who so...

Sitka

(Encyclopedia)Sitka sĭtˈkə [key], city (1990 pop. 8,588), Sitka census div., SE Alaska, in the Alexander Archipelago, on Baranof Island; inc. 1971. Fishing, its first industry, remains important; salmon, halibut...

Yan'an

(Encyclopedia)Yan'an or Yenan both: yĕn-än [key], city (1991 pop. 115,900), N Shaanxi prov., China, on the Yen River. Now a market and tourist center, it is famed as the terminus of the long march and the de fact...