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Lobachevsky, Nikolai Ivanovich

(Encyclopedia)Lobachevsky, Nikolai Ivanovich nyĭkəlīˈ ēväˈnəvĭch ləbəchĕfˈskē [key], 1793–1856, Russian mathematician. A pioneer in non-Euclidean geometry, he challenged Euclid's fifth postulate tha...

cylinder

(Encyclopedia)CE5 Cylinder cylinder, in mathematics, surface generated by a line moving parallel to a given fixed line and continually intersecting a given fixed curve called the directrix; each line of the fam...

Baghdad Railway

(Encyclopedia)Baghdad Railway, railroad of international importance linking Europe with Asia Minor and the Middle East. The line runs from İstanbul, Turkey, to Basra, Iraq; it connected what were distant regions o...

staff

(Encyclopedia)staff, in musical notation, a set of horizontal lines upon and between which notes are written so as to determine their relative pitch, and in connection with a clef, their absolute pitch. Staffs with...

Rzhev

(Encyclopedia)Rzhev ərzhĕfˈ [key], city (1989 est. pop. 70,000), NW European Russia, on the Volga River and on a major rail line to Moscow. It has textile plants and repair shops for railroad equipment. Rzhev, a...

Golden Section

(Encyclopedia)CE5 Rectangle ABCD is a golden rectangle. Removing the square AEFD leaves the rectangle EBCF Golden Section, in mathematics, division of a line segment into two segments such that the ratio of the...

Roh Moo Hyun

(Encyclopedia)Roh Moo Hyun nō mo͞o hyŭn [key], 1946–2009, South Korean politician, president (2003–8) of South Korea. A self-educated lawyer who defended antigovernment activists in the early 1980s, he was e...

rout

(Encyclopedia)rout: see riot, rout, and unlawful assembly. ...

Regulator movement

(Encyclopedia)Regulator movement, designation for two groups, one in South Carolina, the other in North Carolina, that tried to effect governmental changes in the 1760s. In South Carolina, the Regulator movement wa...

industrial management

(Encyclopedia)industrial management, term applied to highly organized modern methods of carrying on industrial, especially manufacturing, operations. Modern technological devices, particularly in the areas of com...