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density

(Encyclopedia)density, ratio of the mass of a substance to its volume, expressed, for example, in units of grams per cubic centimeter or pounds per cubic foot. The density of a pure substance varies little from sam...

Smith, Henry John Stephen

(Encyclopedia)Smith, Henry John Stephen, 1826–83, British mathematician. He was a lecturer in mathematics (1850–73) and, from 1860 to 1883, Savilian professor of geometry at Oxford. He is especially noted for h...

tensor

(Encyclopedia)tensor, in mathematics, quantity that depends linearly on several vector variables and that varies covariantly with respect to some variables and contravariantly with respect to others when the coordi...

Anaximander

(Encyclopedia)Anaximander ənăkˌsĭmănˈdər [key], c.611–c.547 b.c., Greek philosopher, b. Miletus; pupil of Thales. He made the first attempt to offer a detailed explanation of all aspects of nature. Anaxima...

matrix mechanics

(Encyclopedia)matrix mechanics: see quantum theory. ...

prime number

(Encyclopedia)prime number: see number theory. ...

quantum mechanics

(Encyclopedia)quantum mechanics: see quantum theory. ...

wave mechanics

(Encyclopedia)wave mechanics: see quantum theory. ...

Aristarchus of Samos

(Encyclopedia)Aristarchus of Samos ărˌĭstärˈkəs, sāˈmŏs [key], fl. c.310 b.c.–c.230 b.c., Greek astronomer and mathematician of the Alexandrian school. He is said to have been the first to propose a heli...

Adorno, Theodor Wiesengrund

(Encyclopedia)Adorno, Theodor Wiesengrund tāədôrˌ vēˈzəngro͝ond ädôrˈnō [key], 1903–69, German philosopher, born as Theodor Adorno Wiesengrund. Forced into exile by the Nazis (1933), he spent 16 years...