Hans Rådström

Hans Rådström
Born	1919
Died	1970
Citizenship	Sweden
Alma mater
Known for	Rådström isometric embedding of convex subsets in the positive cone of the Lebesgue space of absolutely integrable functions; Rådström characterization of convex sets as generators of continuous semigroups of subsets
Scientific career
Fields	Functional equations, set-valued analysis
Institutions	Institute for Advanced Studies, Princeton University; ; Linköping University
Doctoral advisor	Torsten Carleman, Fritz Carlson
Doctoral students	Per Enflo
Influences	Werner Fenchel Andrew Gleason
Influenced	Karl Johan Åström

Hans Vilhem Rådström (1919–1970) was a Swedish mathematician who worked on complex analysis, continuous groups, convex sets, set-valued analysis, and game theory. From 1952, he was lektor (assistant professor) at , and from 1969, he was Professor of Applied Mathematics at Linköping University.

Hans Rådström was the son of the writer and editor Karl Johan Rådström, and the elder brother of the writer and journalist Pär Rådström.

Rådström studied mathematics and obtained his Ph.D. under the joint supervision of Torsten Carleman and Fritz Carlson. His early work pertained to the theory of functions of a complex variable, particularly, complex dynamics. He was appointed lektor (assistant professor) at Stockholm University in 1952. Later, he was associated with the Royal Institute of Technology in Stockholm.

In 1952 he became co-editor of the Scandinavian popular-mathematics journal Nordisk Matematisk Tidskrift. He also edited the Swedish edition of The Scientific American Book of Mathematical Puzzles and Diversions, a recreational mathematics book by Martin Gardner.

Rådström was interested in Hilbert's fifth problem on the analyticity of the continuous operation of topological groups. The solution of this problem by Andrew Gleason used constructions of subsets of topological vector spaces, (rather than simply points), and inspired Rådström's research on set-valued analysis.

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