born October 29, 1925, Breslau, Germany
University of London (University College London)

Solved in 1955 the famous Thue-Siegel problem concerning the approximation to algebraic numbers by rational numbers and proved in 1952 that a sequence with no three numbers in arithmetic progression has zero density (a conjecture of Erdös and Turán of 1935).

born September 2, 1923, Montbeliard, France
University of Strasbourg

In 1954 invented and developed the theory of cobordism in algebraic topology. This classification of manifolds used homotopy theory in a fundamental way and became a prime example of a general cohomology theory.

This document has been reproduced from

Albers, Donald J.; Alexanderson, G. L.; Reid, Constance:
International mathematical congresses. An illustrated history 1893 - 1986
Rev. ed. including ICM 1986. Springer-Verlag, New York, 1986

with friendly permission from Springer Verlag