## Professor Jan Jaworowski dies at 85

Posted: Monday, July 29, 2013

Jan Jaworowski passed away on April 10, 2013, after a short bout with pneumonia. He was 85 years old.

Jan Jaworowski was an influential theoretical mathematician whose speciality was topology. He received his Ph.D. from the Polish Academy of Sciences in 1955 under the direction of the distinguished mathematician Karol Borsuk, who was a mainstay of postwar Polish Mathematics. Jan left communist Poland and, after visits to Oxford, the Institute for Advanced Studies at Princeton, and Cornell, joined the faculty at Indiana University as full professor in 1965. He had a long and distinguished career, publishing 64 papers over a period of 57 years, and supervising 12 Ph.D. students. His research mainly focused on equivariant topology and generalization of the famous Borsuk-Ulam theorem, one consequence of which is that there are two antipodal points on the earth with exactly the same temperature and humidity. He proved various generalizations of the Borsuk-Ulam theorem, for example, replacing the sphere by a sphere bundle or by a lens space. He gave a characterization of equivariant ANRs, which states, under suitable hypotheses, that a G-space X is a G-ANR if and only if every fixed point set X^H is an ANR. Jan became Professor Emeritus in 1995 but remained active after in mathematics and seminars, writing twelve papers after his "retirement."

Jan will be missed by his colleagues and family.

Samuel N. Rosenberg (translator)