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Stevin, Simon

(Encyclopedia)Stevin, Simon sēˈmôn stəvīnˈ [key], 1548–1620, Dutch engineer and mathematician. His experiments in hydrostatics showed that the pressure exerted by a liquid is dependent only on its vertical ...

Plücker, Julius

(Encyclopedia)Plücker, Julius yo͞oˈlyo͝os plüˈkər [key], 1801–68, German mathematician and physicist. He became professor of mathematics (1836) and of physics (1847) at the Univ. of Bonn. He is known for h...

Cantor, Georg

(Encyclopedia)Cantor, Georg gāˈôrkh känˈtôr [key], 1845–1918, German mathematician, b. St. Petersburg. He studied under Karl Weierstrass and taught (1869–1913) at the Univ. of Halle. He is known for his w...

Boole, George

(Encyclopedia)Boole, George, 1815–64, English mathematician and logician. He became professor at Queen's College, Cork, in 1849. Boole wrote An Investigation of the Laws of Thought (1854) and works on calculus an...

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...

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...

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...

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...

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...