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calculus of variations

(Encyclopedia)calculus of variations, branch of mathematics concerned with finding maximum or minimum conditions for a relationship between two or more variables that depends not only on the variables themselves, a...

Charlottesville

(Encyclopedia)Charlottesville shärˈlətsvĭl [key], city (2020 pop. 46,553), seat of Albemarle co., central Va., on the ...

Gideon v. Wainwright

(Encyclopedia)Gideon v. Wainwright, case decided in 1963 by the U.S. Supreme Court. Clarence Earl Gideon was convicted of a felony in a Florida court. He had defended himself after being denied a request for free c...

Flood, James Clair

(Encyclopedia)Flood, James Clair, 1826–89, American silver magnate, b. New York City. Having been apprenticed to a carriage maker, he left to join the California gold rush in 1849. The following year he returned ...

Weber and Fields

(Encyclopedia)Weber and Fields wĕbˈər [key], American comedy team. The partners were Joe Weber (Joseph Maurice Weber), 1867–1942, and Lew Fields (Lewis Maurice Schanfield), 1867–1941, both born in New York C...

Catlett, Elizabeth

(Encyclopedia)Catlett, Elizabeth, 1915–2012, American-Mexican sculptor, painter, and printmaker, considered one of the foremost African-American artists of her era, b. Washington, D.C., grad. Howard Univ. (B.A., ...

bestiary

(Encyclopedia)bestiary bĕsˈchēĕrˌē [key], a type of medieval book that was widely popular, particularly from the 12th to 14th cent. The bestiary presumed to describe the animals of the world and to show what ...

Black, Jeremiah Sullivan

(Encyclopedia)Black, Jeremiah Sullivan, 1810–83, American cabinet officer, b. Somerset co., Pa. Admitted to the Pennsylvania bar in 1830, Black became a successful lawyer. As U.S. Attorney General (1857–60) und...

relativity

(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...

light

(Encyclopedia)light, visible electromagnetic radiation. Of the entire electromagnetic spectrum, the human eye is sensitive to only a tiny part, the part that is called light. The wavelengths of visible light range ...