Eduard Stiefel

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Eduard Stiefel
Eduard Stiefel ETH-Bib Portr 00817.jpg
Eduard Stiefel, 1955
Born (1909-04-21)21 April 1909
Zürich
Died 25 November 1978(1978-11-25) (aged 69)
Zürich
Nationality Swiss
Fields Mathematics
Institutions ETH Zürich
Alma mater ETH Zürich
Doctoral advisor Heinz Hopf
Doctoral students Corrado Böhm
Jean Descloux
Walter Habicht
Peter Henrici
Peter Läuchli
Max Rössler
Carl Zehnder
Eduard Stiefel (right) together with Otto Volk in Oberwolfach, 1978

Eduard L. Stiefel (21 April 1909 – 25 November 1978) was a Swiss mathematician. Together with Cornelius Lanczos and Magnus Hestenes, he invented the conjugate gradient method, and gave what is now understood to be a partial construction of the Stiefel–Whitney classes of a real vector bundle, thus co-founding the study of characteristic classes.

Stiefel entered the Swiss Federal Institute of Technology in 1928. He received his Ph.D. in 1935 under Heinz Hopf; his dissertation was titled "Richtungsfelder und Fernparallelismus in n-dimensionalen Mannigfaltigkeiten". Stiefel completed his habilitation in 1942. Besides his academic pursuits, Stiefel was also active as a military officer, rising to the rank of colonel in the Swiss army during World War II.

Stiefel achieved his full professorship at ETH Zurich in 1948, the same year he founded the Institute for Applied Mathematics. The objective of the new institute was to design and construct an electronic computer (the Elektronische Rechenmaschine der ETH, or ERMETH). He spent a year in the United States commencing in August, 1951. During this time, he met Magnus Hestenes and many other scientists at the National Bureau of Standards and these professional associations served him well during the remainder of his career at Zurich.

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