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Ohio Company of Associates

(Encyclopedia)Ohio Company of Associates, organization for the purchase and settlement of lands on the Ohio River, founded at Boston in 1786. Its organizers were a group of New England men, most of them former Amer...

Western Union Telegraph Company

(Encyclopedia)Western Union Telegraph Company, enterprise created (1851) to provide telegraphic communications services in the United States. Originally known as the New York and Mississippi Valley Printing Telegra...

Bir Tawil

(Encyclopedia)Bir Tawil, unclaimed territory, c.795 sq mi (2,060 km), along the E Egypt-Sudan border W of the Halayeb Triangle. Its unclaimed status arose from the peculiarities the disputed border: Bir Tawil lies ...

median

(Encyclopedia)median. 1 In statistics, a type of average. In a group of numbers as many numbers of the group are larger than the median as are smaller. In the group 4, 5, 6, 9, 13, 14, 19, the median is 9, three nu...

trigonometry

(Encyclopedia)trigonometry [Gr.,=measurement of triangles], a specialized area of geometry concerned with the properties of and relations among the parts of a triangle. Spherical trigonometry is concerned with the ...

non-Euclidean geometry

(Encyclopedia)non-Euclidean geometry, branch of geometry in which the fifth postulate of Euclidean geometry, which allows one and only one line parallel to a given line through a given external point, is replaced b...

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