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theorem

(Encyclopedia)theorem, in mathematics and logic, statement in words or symbols that can be established by means of deductive logic; it differs from an axiom in that a proof is required for its acceptance. A lemma i...

Royal Concertgebouw Orchestra

(Encyclopedia)Royal Concertgebouw Orchestra, founded 1888, one of the world's foremost orchestras. It performs at the Royal Concertbegouw [concert building], Amsterdam, Netherlands, designed by Adolf Leonard van Ge...

piezoelectric effect

(Encyclopedia)piezoelectric effect pīēˌzōĭlĕkˈtrĭk [key], voltage produced between surfaces of a solid dielectric (nonconducting substance) when a mechanical stress is applied to it. A small current may be ...

Vergennes, Charles Gravier, comte de

(Encyclopedia)Vergennes, Charles Gravier, comte de shärl grävyāˈ kôNt də vĕrzhĕnˈ [key], 1717–87, French statesman. After serving as ambassador at Trier, Constantinople, and Stockholm (where in 1772 he p...

Cronin, James Watson

(Encyclopedia)Cronin, James Watson, 1931–2016, American nuclear physicist, b. Chicago, Ph.D. Univ. of Chicago, 1955. Cronin and co-researcher Val Logsdon Fitch were awarded the 1980 Nobel Prize in Physics for a 1...

Cid

(Encyclopedia)Cid or Cid Campeador sĭd, Span. thēᵺ kämpāäᵺōrˈ [key] [Span.,=lord conqueror], d. 1099, Spanish soldier and national hero, whose real name was Rodrigo (or Ruy) Díaz de Vivar. Under Ferdina...

Charpentier, Emmanuelle Marie

(Encyclopedia)Charpentier, Emmanuelle Marie āmänüĕl märēˈ shärpäNtyāˈ [key], 1968–, French microbiologist, Ph.D. Pierre and Marie Curie Univ., 1995. Following postdoctoral appointments at several insti...

farce

(Encyclopedia)farce, light, comic theatrical piece in which the characters and events are greatly exaggerated to produce broad, absurd humor. Early examples of farce can be found in the comedies of Aristophanes, Pl...

Mathews, Max Vernon

(Encyclopedia)Mathews, Max Vernon, 1926–2011, American engineer known as the father of computer music, b. Columbus, Nebr., grad. California Institute of Technology (B.S., 1950), Massachusetts Institute of Technol...

Arthur I

(Encyclopedia)Arthur I, 1187–1203?, duke of Brittany (1196–1203?), son of Geoffrey, fourth son of Henry II of England and Constance, heiress of Brittany. Arthur, a posthumous child, was proclaimed duke in 1196,...