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Fortune, Robert

(Encyclopedia) Fortune, Robert, 1813–80, British botanist. He traveled in Asia for the Royal Horticultural Society and later for the East India Company and brought back to England a number of…

arithmetic

(Encyclopedia) arithmetic, branch of mathematics commonly considered a separate branch but in actuality a part of algebra. Conventionally the term has been most widely applied to simple teaching of…

chorus, in Greek drama

(Encyclopedia) chorus, in the drama of ancient Greece. Originally the chorus seems to have arisen from the singing of the dithyramb, and the dithyrambic chorus allegedly became a true dramatic chorus…

cube

(Encyclopedia) cube, in geometry, regular solid bounded by six equal squares. All adjacent faces of a cube are perpendicular to each other; any one face of a cube may be its base. The dimensions of a…

Wilkins, Sir George Hubert

(Encyclopedia) Wilkins, Sir George Hubert, 1888–1958, British explorer, b. Australia. He made a number of trips to Antarctica and to the Arctic. Valuable experience gained when he accompanied…

Blau, Joseph Leon

(Encyclopedia) Blau, Joseph LeonBlau, Joseph Leonblou [key] 1909–86, American Jewish scholar and educator, b. Brooklyn, N.Y., grad. Columbia (A.B., 1931; M.A., 1933; Ph.D., 1945). He taught at…

meteor shower

(Encyclopedia) meteor shower, increase in the number of meteors observed in a particular part of the sky. The trails of the meteors of a meteor shower all appear to be traceable back to a single…

chain

(Encyclopedia) chain, flexible series of connected links used in various ways, especially for the transmission of motive power, for hoisting (see pulley), and for securing or fastening. Commonly,…

radical, in mathematics

(Encyclopedia) radical, in mathematics, symbol () placed over a number or expression, called the radicand, to indicate a root of the radicand. When used without a sign or index number, as in 4, it…

group

(Encyclopedia) group, in mathematics, system consisting of a set of elements and a binary operation a∘b defined for combining two elements such that the following requirements are satisfied: (1) The…