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quaternion

(Encyclopedia)quaternion kwətûrˈnēən [key], in mathematics, a type of higher complex number first suggested by Sir William R. Hamilton in 1843. A complex number is a number of the form a+bi when a and b are re...

tangent

(Encyclopedia)tangent, in mathematics. 1 In geometry, the tangent to a circle or sphere is a straight line that intersects the circle or sphere in one and only one point. For other curves and surfaces the tangent l...

engineering

(Encyclopedia)engineering, profession devoted to designing, constructing, and operating the structures, machines, and other devices of industry and everyday life. Until the Industrial Revolution there were only t...

Kepler, Johannes

(Encyclopedia)Kepler, Johannes yōhäˈnəs kĕpˈlər [key], 1571–1630, German astronomer. From his student days at the Univ. of Tübingen, he was influenced by the Copernican teachings. From 1593 to 1598 he was...

Shapley, Lloyd Stowell

(Encyclopedia)Shapley, Lloyd Stowell shăpˈlē [key], 1923–2016, American mathematician and economist, b. Cambridge, Mass., Ph.D Princeton, 1953; son of Harlow Shapley. He worked at the RAND Corp. from 1954 to 1...

Martin, Frank

(Encyclopedia)Martin, Frank fräNk märtăNˈ [key], 1890–1974, Swiss composer, b. Geneva. He studied mathematics and physics at the Univ. of Geneva and studied composition and music with Joseph Lauber and Jaques...

Bolyai

(Encyclopedia)Bolyai bōˈlyoi [key], family of Hungarian mathematicians. The father, Farkas, or Wolfgang, Bolyai, 1775–1856, b. Bolya, Transylvania, was educated in Nagyszeben from 1781 to 1796 and studied in Ge...

Akron, University of

(Encyclopedia)Akron, University of, at Akron, Ohio; coeducational; established 1870 as Buchtel College, transferred 1913 as the nucleus of the Municipal Univ. of Akron. In 1967 the school became a state university....

Henry, Joseph

(Encyclopedia)Henry, Joseph, 1797–1878, American physicist, b. Albany, N.Y., educated at Albany Academy. He taught (1826–32) mathematics and natural philosophy at Albany Academy and was professor of natural phi...

Casanova de Seingalt, Giovanni Giacomo

(Encyclopedia)Casanova de Seingalt, Giovanni Giacomo kăzənōˈvə, Ital. jōvänˈnē jäˈkōmō käzänōˈvä dā sāngältˈ [key], 1725–98, Venetian adventurer, author, and celebrated libertine. He studied...