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limit

(Encyclopedia)limit, in mathematics, value approached by a sequence or a function as the index or independent variable approaches some value, possibly infinity. For example, the terms of the sequence 1⁄2, 1⁄4, ...

pinochle

(Encyclopedia)pinochle pēˈnŭˌkəl [key], card game, probably derived from bezique, that was developed in the United States in the 19th cent. Pinochle is played by two, three, or four players, with a deck of 48 ...

mirror

(Encyclopedia)mirror, in optics, a reflecting surface that forms an image of an object when light rays coming from that object fall upon it (see reflection). Usually mirrors are made of plate glass, one side of whi...

arbitration

(Encyclopedia)arbitration, industrial, method of settling disputes between two parties by seeking and accepting the decision of a third party. Arbritration differs from mediation in that the arbritrator does not at...

crayfish

(Encyclopedia)crayfish or crawfish, freshwater crustacean smaller than but structurally very similar to its marine relative the lobster, and found in ponds and streams in most parts of the world except Africa. Cray...

Clayton Antitrust Act

(Encyclopedia)Clayton Antitrust Act, 1914, passed by the U.S. Congress as an amendment to clarify and supplement the Sherman Antitrust Act of 1890. It was drafted by Henry De Lamar Clayton. The act prohibited exclu...

innate ideas

(Encyclopedia)innate ideas, in philosophy, concepts present in the mind at birth as opposed to concepts arrived at through experience. The theory has been advanced at various times in the history of philosophy to s...

Haring, Keith

(Encyclopedia)Haring, Keith hârˈĭng [key], 1958–90, American artist, b. Kutztown, Pa. He moved to New York City in 1975 and studied at the School of Visual Arts (1978–79). Fascinated with the 1970s graffiti ...

function

(Encyclopedia)function, in mathematics, a relation f that assigns to each member x of some set X a corresponding member y of some set Y; y is said to be a function of x, usually denoted f(x) (read “f of x ”)....

narcolepsy

(Encyclopedia)narcolepsy, a sleep disorder characterized by excessive daytime sleepiness and recurring unwanted episodes of sleep (“sleep attacks”). People with narcolepsy may abruptly fall asleep at almost any...