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Fermat, Pierre de

(Encyclopedia)Fermat, Pierre de pyĕr də fĕrmäˈ [key], 1601–65, French mathematician. A magistrate whose avocation was mathematics, Fermat is known as a founder of modern number theory and probability theory....

Omar Khayyam

(Encyclopedia)Omar Khayyam kīämˈ [key], fl. 11th cent., Persian poet and mathematician, b. Nishapur. He was called Khayyam [tentmaker] probably because of his father's occupation. The details of his life are mos...

Archimedes

(Encyclopedia)Archimedes ärkĭmēˈdēz [key], 287–212 b.c., Greek mathematician, physicist, and inventor. He is famous for his work in geometry (on the circle, sphere, cylinder, and parabola), physics, mechanic...

Ptolemy

(Encyclopedia)Ptolemy (Claudius Ptolemaeus), fl. 2d cent. a.d., celebrated Greco-Egyptian mathematician, astronomer, and geographer. He made his observations in Alexandria and was the last great astronomer of ancie...

Medici, Cosimo II de'

(Encyclopedia)Medici, Cosimo II de', 1590–1621, grand duke of Tuscany (1609–21); son and successor of Ferdinand I de' Medici. Although Cosimo played a role in the War of the Mantuan Succession, he generally avo...

Jungius, Joachim

(Encyclopedia)Jungius, Joachim yōˈäkhĭm yo͝ongˈēo͝os [key], 1587–1657, German mathematician, logician, and systematizer of natural history. In 1608 he made his inaugural dissertation at the Univ. of Giess...

D'Alembert's principle

(Encyclopedia)D'Alembert's principle dălˈəmbârzˌ [key], in mechanics, principle permitting the reduction of a problem in dynamics to one in statics. This is accomplished by introducing a fictitious force equal...

Scheiner, Christoph

(Encyclopedia)Scheiner, Christoph krĭsˈtôf shīnˈər [key], 1579?–1650, German astronomer and mathematician, a Jesuit priest. He taught at Ingolstadt, Rome, and elsewhere and became rector of a Jesuit college...

Poncelet, Jean Victor

(Encyclopedia)Poncelet, Jean Victor zhäNˈ vēktôrˈ pôNslāˈ [key], 1788–1867, French mathematician and army engineer. He taught at the school of mechanics at Metz and at the Faculté des Sciences and the É...

Philomena of Dacia, Peter

(Encyclopedia)Philomena of Dacia, Peter, or Peter Nightingale, fl. 1291–1303, Danish astronomer and mathematician. He taught at the Univ. of Bologna (1291–92) and in Paris, and was a canon of Roskilde Cathedral...