born January 24, 1931, Mjällby/Blekinge, Sweden
Worked in partial diffential equations. Specifically, contributed to the general theory of linear differential operators. The questions go back to one of Hilbert's problems at the 1900 congress.
born February 20, 1931, Orange, New Jersey
Proved that a 7-dimensional sphere can have several differential structures; this led to the creation of the field of differential topology.
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