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non-Euclidean geometry

(Encyclopedia)non-Euclidean geometry, branch of geometry in which the fifth postulate of Euclidean geometry, which allows one and only one line parallel to a given line through a given external point, is replaced b...

Onassis, Aristotle Socrates

(Encyclopedia)Onassis, Aristotle Socrates ârˌĭstŏtˈəl sŏkˈrətēz ōnăsˈĭs [key], 1906?–75, Greek shipowner and financier, b. Turkey. Leaving Turkey after the Turkish defeat of Greek forces at Smyrna (...

Banneker, Benjamin

(Encyclopedia)Banneker, Benjamin, 1731–1806, African-American inventor, astronomer, and mathematician, b. Baltimore co., Md., at what is now Ellicott's Mills. A free black, Banneker was essentially self-taught. H...

Tarski, Alfred

(Encyclopedia)Tarski, Alfred tärˈskē [key], 1901–83, Polish-American mathematician and philosopher, Ph.D. Univ. of Warsaw, 1924, b. Alfred Teitelbaum, changed his named 1923. He lectured at Warsaw until 1939, ...

Al-Battani

(Encyclopedia)Al-Battani ălˌbətēˈnēəs [key], b. before 858, d. 929, Arab astronomer and mathematician. He is best known in astronomy for his improvements and corrections of the Ptolemaic tradition. His Kitab...

Huygens, Christiaan

(Encyclopedia)Huygens, Christiaan krĭsˈtyän hoiˈgəns [key], 1629–95, Dutch mathematician and physicist; son of Constantijn Huygens. He improved telescopic lenses and discovered (1655) a satellite of Saturn a...

Jacobi, Carl Gustav Jacob

(Encyclopedia)Jacobi, Carl Gustav Jacob kärl go͝osˈtäf yäˈkôp yäkôˈbē [key], 1804–51, German mathematician. He was an outstanding teacher and was professor of mathematics at Königsberg (1827–42) and...

Du Châtelet-Lomont, Gabrielle Émilie le Tonnelier de Breteuil, marquise

(Encyclopedia)Du Châtelet-Lomont, Gabrielle Émilie le Tonnelier de Breteuil, marquise gäbrēĕlˈ āmēlēˈ lə tōnəlyāˈ də brətöˈyə märkēzˈ dü shätəlāˈ-lōmōNˈ [key], 1706–49, French mathe...

Echegaray, José

(Encyclopedia)Echegaray, José hōsāˈ āchāgärīˈ [key], 1832–1916, Spanish dramatist, mathematician, physicist, economist, and politician. He taught science, practiced engineering, and devoted his later lif...

Ehrenfest, Paul

(Encyclopedia)Ehrenfest, Paul poul āˈrənfĕst [key], 1880–1933, Austrian physicist. In 1904, Ehrenfest received his doctorate in theoretical physics in Vienna and married the Russian mathematician Tatyana Alex...