Ernest Michael

Who was Ernest Michael?

Ernest A. Michael was a prominent American mathematician known for his work in the field of general topology, most notably for his pioneering research on set-valued mappings. He is credited with developing the theory of continuous selections. The Michael selection theorem is named for him, which he proved in. Michael is also known in topology for the Michael line, a paracompact space whose product with the topological space of the irrational numbers is not normal. He wrote over 100 papers, mostly in the area of general topology. Michael's Erdős number is 2.

Michael was born in Zürich, Switzerland, August 26, 1925, to German Jewish parents, Jacob and Erna Michael. He lived in Berlin, Germany, until 1932. Anticipating the burgeoning threat of Nazism, his family moved to The Hague, Netherlands, and then to New York in 1939. Michael attended Horace Mann High School, graduating at age 15. His undergraduate career at Cornell University was interrupted when he enlisted in the United States Navy, where he served aboard the USS Kwajalein. He returned to Cornell, where he received his B.A. in 1947. He earned his M.A. from Harvard University in 1948, and Ph.