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matrix mechanics
(Encyclopedia)matrix mechanics: see quantum theory. ...wave mechanics
(Encyclopedia)wave mechanics: see quantum theory. ...Health, Education, and Welfare, United States Department of
(Encyclopedia)Health, Education, and Welfare, United States Department of: see Education, United States Department of; Health and Human Services, United States Department of. ...Damon and Pythias
(Encyclopedia)Damon and Pythias dāˈmən, pĭthˈēəs [key], two youths whose loyalty to each other symbolizes true friendship. Pythias, a Pythagorean, condemned to death for plotting against Dionysius I of Syrac...Vienna, city and province, Austria
(Encyclopedia)Vienna vēĕnˈə [key], Ger. Wien, city and province (1991 pop. 1,539,848), 160 sq mi (414 sq km), capital and largest city of Austria and administrative seat of Lower Austria, NE Austria, on the Dan...Heisenberg, Werner
(Encyclopedia)Heisenberg, Werner vĕrˈnər hīˈzənbĕrk [key], 1901–76, German physicist. One of the founders of the quantum theory, he is best known for his uncertainty principle, or indeterminacy principle, ...Stuart, Frances Teresa, duchess of Richmond and Lennox
(Encyclopedia)Stuart or Stewart, Frances Teresa, duchess of Richmond and Lennox: see Richmond and Lennox, Frances Teresa Stuart, duchess of. ...Ferdinand IV, Spanish king of Castile and León
(Encyclopedia)Ferdinand IV, 1285–1312, Spanish king of Castile and León (1295–1312), son and successor of Sancho IV. His mother, María de Molina, was regent during his turbulent minority. He tried unsuccessfu...John II, Spanish king of Castile and León
(Encyclopedia)John II, 1405–54, Spanish king of Castile and León (1406–54), son and successor of Henry III. He was little interested in government, which he entrusted to his favorite Alvaro de Luna. Literature...Sancho IV, Spanish king of Castile and León
(Encyclopedia)Sancho IV (Sancho the Brave) sänˈchō [key], 1257?-1295, Spanish king of Castile and León (1284–95), son and successor of Alfonso X. On the death (1275) of his elder brother, Ferdinand de la Cerd...Browse by Subject
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