Paulo Ribenboim, Brazilianborn Canadian mathematician (Recife 13 March 1928
Authored nearly 120 works
INTRODUCED The notion of the rings of generalized power series The notion of the Ptorsion subgroup of a group Several types of realization of groups A general fixedpoint theorem for multivalued mappings defined on generalized ultrametric spaces (with S. PriessCrampe)
EPONYMY Ribenboim approximation theorem Ribenboim fixedpoint theorem KrullRibenboim approximation Ribenboim functions Ribenboim generalized formal power series

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