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ring, mathematical system

(Encyclopedia)ring, in mathematics, system consisting of a set R of elements and two binary operations, such that addition makes R a commutative group and multiplication is associative and distributes over addition...

Cassel, Gustav

(Encyclopedia)Cassel, Gustav go͝osˈtäf käˈsəl [key], 1866–1945, Swedish economist and authority on international monetary problems. He was a delegate to many world economic conferences and wrote valuable pa...

Ouro Prêto

(Encyclopedia)Ouro Prêto ōˈro͝o prāˈto͝o [key] [Port.,=black gold], city (1996 pop. 61,606), Minas Gerais state, E Brazil. Founded as Vila Rica in the gold rush near the end of the 17th cent., it became a pr...

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