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Sylvester, James Joseph

(Encyclopedia) Sylvester, James Joseph, 1814–97, English mathematician. He studied at Cambridge for four years after 1831, but because degrees were limited to members of the Church of England and he…

Perry, William James

(Encyclopedia) Perry, William James, 1927–, U.S. government official, b. Vandergrift, Pa. A Ph.D. in mathematics, former Stanford engineering professor, and founder of a military electronics firm, he…

The Chemical Elements

Elements are the building blocks of nature. Water, for example, is a compound composed of two ingredients: hydrogen and oxygen elements. Each element is a pure substance that cannot be split up…

Flashcards

Practice your math facts with these flashcards. Find addition, subtraction, multiplication and division flashcards, from basic math facts to 3-digit problems. …

Flashcards Explained

Math Flashcards Addition Subtraction Multiplication Division Addition & Subtraction Terms Used in Addition Terms Used in Subtraction Terms Used in Multiplication Terms…

actinide series

(Encyclopedia) actinide series, a series of radioactive metallic elements in Group 3 of the periodic table. Members of the series are often called actinides, although actinium (at. no. 89) is not…

Monaghan, county, Ireland

(Encyclopedia) MonaghanMonaghanmŏnˈəhən, –hănˌ [key], county (1991 pop. 51,293), 498 sq mi (1,290 sq km), N Republic of Ireland, bordered on the N by Northern Ireland. The county seat is Monaghan.…

Moscheles, Ignaz

(Encyclopedia) Moscheles, IgnazMoscheles, Ignazĭgˈnäts mōshˈəlĕs [key], 1794–1870, Bohemian-German musician. Born in Prague, Moscheles was a child prodigy. He studied in Vienna with Johann…