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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...

Ter Borch, Gerard

(Encyclopedia)Ter Borch or Terborch, Gerard gāˈrärt tərbôrkhˈ [key], 1617–81, Dutch genre and portrait painter. He studied with his father and traveled throughout Europe, showing extraordinary precocity in ...

Rivlin, Alice M.

(Encyclopedia)Rivlin, Alice M., 1931–2019, American economist, b. Philadelphia as Georgianna Alice Mitchell, Ph.D. Harvard, 1958. Rivlin was affiliated with the Brookings Institution at various times from 1957 un...

corundum

(Encyclopedia)corundum kərŭnˈdəm [key], mineral, aluminum oxide, Al2O3. The clear varieties are used as gems and the opaque as abrasive materials. Corundum occurs in crystals of the hexagonal system and in mass...

Fagan, Garth

(Encyclopedia)Fagan, Garth, 1940–, Jamaican-American dancer and choreographer. He studied with Ivy Baxter and left Jamaica to dance with her company. Settling (1960) in Detroit, he attended Wayne State Univ. (gra...

Faidherbe, Louis Léon César

(Encyclopedia)Faidherbe, Louis Léon César lwē lāôNˈ sāzärˈ fādĕrbˈ [key], 1818–89, French colonial administrator. He was a leading participant in the establishment of the French colonial empire in Afr...

Turrell, James

(Encyclopedia)Turrell, James, 1943–, American installation and land artist, b. Los Angeles, grad. Pomona College (B.A., 1965), Claremont Graduate School (M.F.A., 1973). Turrell's career began in the 1960s art sce...

Uruk

(Encyclopedia)Uruk ēˈrĕk [key], ancient Sumerian city of Mesopotamia, on the Euphrates and NW of Ur (in present-day S Iraq). It is the modern Tall al Warka. Uruk, dating from the 5th millennium b.c., was the lar...

Polke, Sigmar

(Encyclopedia)Polke, Sigmar, 1941–2011, innovative German artist best known for his paintings and photography. His family immigrated from East to West Germany in 1953, and he lived in Düsseldorf, studying (1961�...

Flight 93 National Memorial

(Encyclopedia)Flight 93 National Memorial, memorial, visitors complex, and other facilities at the site of the crash of the hijacked United Airlines Flight 93 on Sept. 11, 2001, near Shanksville, Pa. The grounds, 2...