Mathematician:Hellmuth Kneser

Mathematician
German mathematician, who made notable contributions to group theory and topology.

Derived the theorem on the existence of a prime decomposition for $3$-manifolds.

Originated the concept of a normal surface. Member of the Nazi party in Germany during the middle of the 20th century.

Nationality
German

History

 * Born: 16 April 1898, Dorpat, Russia (now Tartu, Estonia)
 * Died: 23 August 1973, Tübingen, Germany

Theorems and Definitions

 * Kneser's Lemma
 * Radó-Kneser-Choquet Theorem (with and )

Publications

 * 1921: Untersuchungen zur Quantentheorie