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calculus of variations

(Encyclopedia)calculus of variations, branch of mathematics concerned with finding maximum or minimum conditions for a relationship between two or more variables that depends not only on the variables themselves, a...

Bouillon, Henri de La Tour d'Auvergne, vicomte de Turenne, duc de

(Encyclopedia)Bouillon, Henri de La Tour d'Auvergne, vicomte de Turenne, duc de dük də bo͞oyôNˈ [key], 1555–1623, marshal of France, diplomat, and Protestant leader. He served with Henry IV against the Cath...

pi

(Encyclopedia)pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol for pi is π. The ratio is the same for all circles and is approximately 3.1416. It is of great importance in...

Swiss literature

(Encyclopedia)Swiss literature. The literature of Switzerland is written in German, French, Italian, and Romansh, with German predominating. The extensive literature in Romansh dialect (see Rhaeto-Romanic) is littl...

infinity

(Encyclopedia)infinity, in mathematics, that which is not finite; it is often indicated by the symbol ∞. A sequence of numbers, a1, a2, a3, … , is said to “approach infinity” if the numbers eventually b...

Barenboim, Daniel

(Encyclopedia)Barenboim, Daniel bârˈənboimˌ [key], 1942–, Israeli pianist and conductor, b. Buenos Aires, Argentina. He made his debut in Buenos Aires at seven. His family settled in Israel in 1952, and he st...

Battenberg

(Encyclopedia)Battenberg bătˈənbûrg [key], German princely family, issued from the morganatic union of Alexander, a younger son of Louis II, grand duke of Hesse-Darmstadt, and Countess Julia von Hauke, who was ...

counterpoint

(Encyclopedia)counterpoint, in music, the art of combining melodies each of which is independent though forming part of a homogeneous texture. The term derives from the Latin for “point against point,” meaning ...

Old Catholics

(Encyclopedia)Old Catholics, Christian denomination established by German Catholics who separated themselves from the Roman Catholic Church when they rejected (1870) the decrees of the First Vatican Council, especi...

West, Benjamin

(Encyclopedia)West, Benjamin, 1738–1820, American historical painter who worked in England. He was born in Springfield, Pa., in a house that is now a memorial museum at Swarthmore College. After some instruction ...