Hans Freudenthal (September 17, 1905 – October 13, 1990) was a Dutch mathematician born in Luckenwalde in Germany into a Jewish family. He made substantial contributions to algebraic topology and also took an interest in literature, philosophy, history and mathematics education. September 17 is the 260th day of the year (261st in leap years). ... 1905 (MCMV) was a common year starting on Sunday (see link for calendar). ... October 13 is the 286th day of the year (287th in leap years). ... This article is about the year. ... This article is in need of attention from an expert on the subject. ... Luckenwalde: a town in the district of Teltow-Fläming in the state of Brandenburg, Germany. ... Jews (Hebrew: יהודים, Yehudim) are followers of Judaism or, more generally, members of the Jewish people (also known as the Jewish nation, or the Children of Israel), an ethno-religious group descended from the ancient Israelites and converts who joined their religion. ... Algebraic topology is a branch of mathematics in which tools from abstract algebra are used to study topological spaces. ... Literature is literally acquaintance with letters as in the first sense given in the Oxford English Dictionary (from the Latin littera meaning an individual written character (letter)). The term has generally come to identify a collection of texts, which in Western culture are mainly prose, both fiction and non-fiction... To meet Wikipedias quality standards, this article or section may require cleanup. ... Wikimedia Commons has media related to: History For other senses of this word, see history (disambiguation). ...

Freudenthal did his thesis work with Heinz Hopf and defended a thesis on the ends of topological groups in 1930. He was officially awarded a degree in October 1931. He then went to Amsterdam to serve as assistant to Brouwer. In 1937 he proved the Freudenthal suspension theorem. Heinz Hopf (November 19, 1894 – June 3, 1971) was a mathematician born in Gräbschen, Germany. ... In mathematics, a topological group G is a group that is also a topological space such that the group multiplication G × G → G and the inverse operation G → G are continuous maps. ... 1930 (MCMXXX) is a common year starting on Wednesday. ... Look up October in Wiktionary, the free dictionary. ... 1931 (MCMXXXI) was a common year starting on Thursday (link is to a full 1931 calendar). ... Brouwer is the last name of different people. ... 1937 (MCMXXXVII) was a common year starting on Friday (link will take you to calendar). ... In mathematics, and specifically in the field of homotopy theory, the Freudenthal Suspension Theorem is the fundamental result leading to the concept of stabilization of homotopy groups and ultimately to stable homotopy theory. ...

In 1941 Freudenthal was suspended from duties at the University of Amsterdam by the Nazis. His wife, however, was not Jewish, and he was not deported. For the movie, see 1941 (film) 1941 (MCMXLI) was a common year starting on Wednesday (the link is to a full 1941 calendar). ... From Athenaeum Illustre to University In January 1632 two internationally acclaimed scientists, Caspar Barlaeus and Gerardus Vossius, held their inaugural speech in the Athenaeum Illustre - the illustrious school - which had its seat in the 14th-century Agnietenkapel. ... The Nazi party used a right-facing swastika as their symbol and the red and black colors were said to represent Blut und Boden (blood and soil). ...

Later in his life, Freudenthal focused on elementary mathematics education.

External link

• John J. O'Connor and Edmund F. Robertson. Hans Freudenthal at the MacTutor archive.