Paulo Ribenboim, Brazilian-born Canadian mathematician (Recife 13 March 1928-

Authored nearly 120 works

INTRODUCED

The notion of the rings of generalized power series

The notion of the P-torsion subgroup of a group

Several types of realization of groups

A general fixed-point theorem for multivalued mappings defined on generalized ultrametric spaces (with S. Priess-Crampe)

EPONYMY

Ribenboim approximation theorem  

Ribenboim fixed-point theorem  

Krull-Ribenboim approximation  

Ribenboim functions

Ribenboim generalized formal power series