- Industria: Library & information science
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Project Gutenberg (PG) is a volunteer effort to digitize and archive cultural works, to encourage the creation and distribution of eBooks. It was founded in 1971 by Michael S. Hart and is the oldest digital library. Most of the items in its collection are the full texts of public domain books. The ...
A painter, born at Antwerp; settled at Bologna, where he founded a school, from whence issued many eminent artists, among others Guidi Reni, Domenichino, and Albani; his masterpiece, "St. Michael" in St. Peter's, Bologna (1555-1619).
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In mathematics, is the method by which we discuss the properties of continuously varying quantities. The nature of the method and the necessity for it may be indicated by a simple example; e. g. the motion of a train in a track, or the motion of a planet in its orbit. If we know the successive positions of the moving body at successive short intervals of time, the rules of the differential calculus enable us to calculate the speed, the change of speed, the change of direction of motion (i. e. the curvature of the path), and the effective force acting on the body. Conversely, given the force at every point, and the initial position and velocity, the rules of the integral calculus assist us in calculating the position and velocity of the body at any future time. Expressed somewhat crudely, the differential calculus has to do with the differentials (increments or decrements) of varying quantities; while the integral calculus is a process of summation or integration of these differentials.
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Grandson of the preceding, and heir to his rights; revived the struggle in 1870, but fared no better than his grandfather; took refuge in London; b. 1848.
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A Scotch Covenanter, born in Perthshire; was minister of the Barony Parish, Glasgow; fought at Bothwell Brig; suffered at the Cross of Edinburgh for daring to excommunicate the king; died with the faith and courage of a martyr (1619-1681).
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Played an important part in the Fronde and in the plots against Richelieu and Mazarin; her Life has been written by Victor Cousin (1600-1679).
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A Spanish statesman; minister of Ferdinand VII.; a violent enemy of liberal principles and measures, and a reactionary; obnoxious to the people; arrested for treachery, escaped into France by bribing his captors (1773-1842).
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Prussian general, commanded the Prussian and Austrian forces levied to put down the French Revolution; emitted a violent, blustering manifesto, but a Revolutionary army under Dumouriez and Kellermann met him at Valmy, and compelled him to retreat in 1792; was beaten by Davout at Auerstadt, and mortally wounded (1735-1806).
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Brother of Queen Caroline; raised troops against France, which, being embarked for England, took part in the Peninsular war; fell fighting at Ligny, two days before the battle of Waterloo (1771-1815).
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Favourite of James I. and Charles I., born in Leicestershire; rose under favour of the former to the highest offices and dignities of the State; provoked by his conduct wars with Spain and France; fell into disfavour with the people; was assassinated at Portsmouth by Lieutenant Felton, on the eve of his embarking for Rochelle (1592-1628).
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Lawyer and politician, born in co. Down, Ireland; called to the English bar; entered Parliament, representing Belfast; became Lord Chancellor under Disraeli's government in 1868, and again in 1874; took an active interest in philanthropic movements (1819-1885).
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