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Reynolds, Osborne

(Encyclopedia)Reynolds, Osborne, 1842–1912, British mechanical engineer. He was educated at Cambridge and became (1868) the first professor of engineering at the Univ. of Manchester, where his courses attracted a...

field, in algebra

(Encyclopedia)field, in algebra, set of elements (usually numbers) that may be combined under the operations of addition and multiplication so that it constitutes an additive group, the nonzero elements form a mult...

polygon

(Encyclopedia)polygon, closed plane figure bounded by straight line segments as sides. A polygon is convex if any two points inside the polygon can be connected by a line segment that does not intersect any side. I...

Ramanujan, Srinivasa

(Encyclopedia)Ramanujan, Srinivasa shrēˌnĭväˈsə rämäˈno͝ojən [key], 1889–1920, Indian mathematician. He was a self-taught genius in pure mathematics who made original contributions to function theory, ...

matrix

(Encyclopedia)matrix, in mathematics, a rectangular array of elements (e.g., numbers) considered as a single entity. A matrix is distinguished by the number of rows and columns it contains. The matrix CE5 is a 2...

Sino-Tibetan languages

(Encyclopedia)Sino-Tibetan languages, family of languages spoken by over a billion people in central and SE Asia. This linguistic family is second only to the Indo-European stock in the number of its speakers. It i...

nucleus, in physics

(Encyclopedia)nucleus, in physics, the extremely dense central core of an atom. Following the discovery of radioactivity by A. H. Becquerel in 1896, Ernest Rutherford identified two types of radiation given off b...

Tomlin, Bradley Walker

(Encyclopedia)Tomlin, Bradley Walker, 1899–1953, American painter, b. Syracuse, N.Y., grad. Syracuse Univ. (1921). He also studied painting in London and Paris. His early work includes cover designs for Vogue and...

Serengeti National Park

(Encyclopedia)Serengeti National Park, c.5,700 sq mi (14,800 sq km), NE Tanzania, est. 1941. The internationally famous park attracts large numbers of tourists to see the world's largest concentrations of wildebees...

blood count

(Encyclopedia)blood count, method for determining the number of red (erythrocytes) and white (leukocytes) blood cells in a certain volume of blood. This test can be used as a preliminary step in diagnosing some dis...