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e, in mathematics

(Encyclopedia)e, in mathematics, irrational number occurring widely in mathematics and science, approximately equal to the value 2.71828; it is the base of natural, or Naperian, logarithms. The number e is defined ...

harpsichord

(Encyclopedia)CE5 Harpsichord harpsichord, stringed musical instrument played from a keyboard. Its strings, two or more to a note, are plucked by quills or jacks. The harpsichord originated in the 14th cent. an...

Jones, Inigo

(Encyclopedia)Jones, Inigo ĭnˈĭgōˌ [key], 1573–1652, one of England's first great architects. Son of a London clothmaker, he was enabled to travel in Europe before 1603 to study paintings, perhaps at the exp...

statistics

(Encyclopedia)statistics, science of collecting and classifying a group of facts according to their relative number and determining certain values that represent characteristics of the group. The most familiar stat...

spire

(Encyclopedia)spire, high, tapering structure crowning a tower and having a general pyramidal outline. The simplest spires were the steeply pitched timber roofs capping Romanesque towers and campaniles. In later Ro...

Cai Guo-Qiang

(Encyclopedia)Cai Guo-Qiang, 1957–, Chinese painter and a sculptor especially known for using gunpowder as a medium and explosions and fireworks as means of artistic expression, b. Quanzhou, Fujian prov., studied...

pi

(Encyclopedia)pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol for pi is π. The ratio is the same for all circles and is approximately 3.1416. It is of great importance in...

Zhao Ziyang

(Encyclopedia)Zhao Ziyang or Chao Tzu-yang both: zhou zēyäng [key], 1919–2005, Chinese Communist leader. He joined the party in 1938, was active as a local party leader during World War II, and by the 1960s was...

Nyamuragira

(Encyclopedia)Nyamuragira or Nyamulagira, active volcano (11,033 ft/3,058 m), S Virunga range, in E Congo (Kinshasa) near the Rwanda border, N of Lake Kivu and 15 mi (25 km) N of Goma, in S Virunga National Park. A...

Villari, Pasquale

(Encyclopedia)Villari, Pasquale päskwäˈlā vēlˈlärē [key], 1826–1917, Italian historian and statesman. He took part in the Revolution of 1848, served in the legislative chamber (1867–82), and was ministe...