Felix Hausdorff

Felix Hausdorff (November 8, 1868 – January 26, 1942) was a German mathematician who is considered to be one of the founders of modern topology and who contributed significantly to set theory and functional analysis. He defined and studied partially ordered sets, Hausdorff spaces, and the Hausdorff dimension, proved the Hausdorff maximality theorem, solved what is now called the Hausdorff moment problem, and published philosophical and literary works under the pseudonym "Paul Mongré". Image File history File linksMetadata Download high resolution version (1000x1500, 236 KB) Felix Hausdorff, mathematician. ... Image File history File linksMetadata Download high resolution version (1000x1500, 236 KB) Felix Hausdorff, mathematician. ... November 8 is the 312th day of the year (313th in leap years) in the Gregorian Calendar, with 53 days remaining. ... 1868 (MDCCCLXVIII) was a leap year starting on Wednesday (see link for calendar) of the Gregorian calendar or a leap year starting on Friday of the 12-day-slower Julian calendar. ... January 26 is the 26th day of the year in the Gregorian calendar. ... This article is about the year. ... A mathematician is a person whose primary area of study and research is mathematics. ... Topology (Greek topos, place and logos, study) is a branch of mathematics concerned with spatial properties preserved under bicontinuous deformation (stretching without tearing or gluing); these are the topological invariants. ... Set theory is the mathematical theory of sets, which represent collections of abstract objects. ... Functional analysis is that branch of mathematics and specifically of analysis which is concerned with the study of spaces of functions. ... In mathematics, especially order theory, a partially ordered set (or poset for short) is a set equipped with a partial order relation. ... In topology and related branches of mathematics, a Hausdorff space is a topological space in which points can be separated by neighbourhoods. ... In mathematics, the Hausdorff dimension is an extended non-negative real number (that is a number in the closed infinite interval [0, ∞]) associated to any metric space . ... The Hausdorff maximality theorem, formulated and proved by Felix Hausdorff in 1914, is an alternate formulation of Zorns lemma and therefore also equivalent to the axiom of choice. ... In mathematics, the Hausdorff moment problem, named after Felix Hausdorff, asks for necessary and sufficient conditions that a given sequence { Î¼n : n = 1, 2, 3, ... } be the sequence of moments of some probability distribution, with cumulative distribution function F, supported on the closed unit interval [0, 1]. In 1921, Hausdorff...

Hausdorff studied in Leipzig and taught mathematics there until 1910, when he became professor of mathematics in Bonn. He was professor in Greifswald from 1913 to 1921. When the Nazis came to power, Hausdorff, who was Jewish, felt that as a respected university professor he would be spared from persecution. However, his abstract mathematics was denounced as "Jewish", useless, and "un-German" and he lost his position in 1935. When in 1942 he could no longer avoid being sent to a concentration camp, Hausdorff committed suicide together with his wife and sister-in-law on the 26th of January. (help· info) [] (Sorbian/Lusatian: Lipsk) is the largest city in the Federal State (Bundesland) of Saxony in Germany. ... -1... Bonn is a city in Germany (19th largest), in the Federal State of North Rhine-Westphalia, located about 20 kilometres south of Cologne on the river Rhine in the north of the Siebengebirge. ... Greifswald (German Greif=griffin, Wald=forest) is a city in Mecklenburg-Western Pomerania, Germany. ... 1913 (MCMXIII) was a common year starting on Wednesday. ... 1921 (MCMXXI) was a common year starting on Saturday (see link for calendar). ... The term National Socialism has been used in self-description by a number of different political groups and ideologies, some of which have no connection with the Nazis; see National socialism (disambiguation). ... 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. ... 1935 (MCMXXXV) was a common year starting on Tuesday (link will take you to calendar). ... Suicide (from Latin sui caedere, to kill oneself) is the act of willfully ending ones own life. ...

Important publications

• Grundzüge der Mengenlehre

== Grundzüge der Mengenlehre (German: Basics of set theory) is an influential book on set theory written by Felix Hausdorff. ...

• Homepage of the Hausdorff Edition (german)
• Hausdorff Findbuch
• MacTutor History of Mathematics entry for Hausdorff[[