• Source: Hellmuth Kneser

Hellmuth Kneser (16 April 1898 – 23 August 1973) was a 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 φ such that φ(φ(z)) = exp(z).
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




References






External links


O'Connor, John J.; Robertson, Edmund F., "Hellmuth Kneser", MacTutor History of Mathematics Archive, University of St Andrews
Hellmuth Kneser at the Mathematics Genealogy Project

Kata Kunci Pencarian:

• Teorema dasar aljabar
• Hellmuth Kneser
• Kneser
• Adolf Kneser
• Kneser's theorem (differential equations)
• Martin Kneser
• Radó–Kneser–Choquet theorem
• Fundamental theorem of algebra
• Oberwolfach Research Institute for Mathematics
• Reinhold Baer
• Functional square root