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empiricism

(Encyclopedia)empiricism ĕmpĭrˈĭsĭzəm [key] [Gr.,=experience], philosophical doctrine that all knowledge is derived from experience. For most empiricists, experience includes inner experience—reflection upo...

planetary science

(Encyclopedia)planetary science or planetology, study of planets and planetary systems as a whole. Planetary science applies the theories and methods of traditional disciplines such as astronomy, geology, physics, ...

Arnold, Thomas

(Encyclopedia)Arnold, Thomas, 1795–1842, English educator, b. Isle of Wight, educated at Winchester school and at Corpus Christi College, Oxford. He was a fellow of Oriel College, Oxford, from 1815 to 1819, was o...

Dirac, Paul Adrien Maurice

(Encyclopedia)Dirac, Paul Adrien Maurice dĭrăkˈ [key], 1902–84, English physicist. He was educated at the Univ. of Bristol and St. John's College, Cambridge, and became professor of mathematics at Cambridge in...

Naoroji, Dadabhai

(Encyclopedia)Naoroji, Dadabhai däˈdəbəhī närōˈjē [key], 1825–1917, Indian nationalist leader. The son of a Parsi priest, at 27 he became professor of mathematics at Elphinstone Institution, Bombay (now ...

zero

(Encyclopedia)zero, that number which, when added to any number, leaves the latter unchanged; its symbol is 0. The introduction of zero into the decimal system was the most significant achievement in the developmen...

Mercator, Gerardus

(Encyclopedia)Mercator, Gerardus gārˈhärt krāˈmər [key], 1512–94, Flemish geographer, mathematician, and cartographer. He studied in Louvain, where he had a geographical establishment (1534). From 1537 to 1...

Hill, Daniel Harvey

(Encyclopedia)Hill, Daniel Harvey, 1821–89, Confederate general in the American Civil War, b. York District, S.C. He served in the Mexican War but resigned from the army in 1849. He was professor of mathematics a...

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....

Ricci, Matteo

(Encyclopedia)Ricci, Matteo mät-tāˈō rētˈchē [key], 1552–1610, Italian missionary to China. He entered the Society of Jesus, and in Rome he studied under Clavius. Ricci was sent to the Indies (1578), and h...