Hellmuth Kneser
Hellmuth Kneser (16 April 1898 – 23 August 1973) was a Baltic German mathematician, who made notable contributions to group theory and topology. His most famous result may be his theorem on the existence of a prime decomposition for 3-manifolds. His proof originated the concept of normal surface, a fundamental cornerstone of the theory of 3-manifolds. He was born in Dorpat, Russian Empire (now Tartu, Estonia) and died in Tübingen, Germany. He was the son of the mathematician Adolf Kneser and the father of the mathematician Martin Kneser. He assisted Wilhelm Süss in the founding of the Mathematical Research Institute of Oberwolfach and served as the director of the institute from 1958  to 1959. He was an editor of Mathematische Zeitschrift, Archiv der Mathematik and Aequationes Mathematicae. Kneser formulated the problem of non-integer iteration of functions and proved the existence of the entire Abel function of the exponential; on the base of this Abel function, he constructed the functional square root of the exponential function as a half-iteration of the exponential, i.e. a function  such that . Kneser was a student of David Hilbert. He was an advisor of a number of notable mathematicians, including Reinhold Baer. Hellmuth Kneser was a member of the NSDAP and also the SA. In July 1934 he wrote to Ludwig Bieberbach a short note supporting his anti-semitic views and stating: "May God grant German science a unitary, powerful and continued political position." Selected publications
 Funktionentheorie. Studia Mathematica, Göttingen, 1958; 2nd edition 1966. Gerhard Betsch, Karl H. Hofmann (eds. ): Gesammelte Abhandlungen, De Gruyter 2005; 2011 pbk reprint

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1898 births
1973 deaths
People from Tartu
People from Kreis Dorpat
Baltic-German people
Emigrants from the Russian Empire to Germany
Nazi Party members
20th-century German mathematicians
Group theorists
Topologists
Academic staff of the University of Greifswald
Sturmabteilung personnel