Felix Iversen

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Felix Christian Herbert Iversen (born October 22, 1887 in Lübeck , † July 31, 1973 in Helsinki ) was a Finnish mathematician and pacifist .

Felix Iversen grew up in Viipuri . He studied from 1904 at the University of Helsinki and graduated there in 1909. He undertook several study trips to Germany, but the initiator and supervisor of his dissertation, completed in 1914, was Ernst Lindelöf . From 1911 to 1915 he was an assistant at the University of Helsinki, then lecturer until 1920 and from then until his retirement in 1954 adjunct . By 1922 he appears to have given up scientific research and concentrated on teaching. He wrote textbooks on spherical trigonometry and analytical geometry .

Iversen's mathematical research was in the field of function theory . Here he is known for Iversen's theorem from his dissertation, which says that a Picardian exception value of a function that is meromorphic in the plane is an asymptotic value. The classification of singularities of the inverse function into direct and indirect singularities also goes back to his dissertation. Also mentioned is his example, constructed in 1915, of an entire function for which the set of asymptotic values ​​can be counted over . This was generalized by Gross , who constructed an example where every complex number is asymptotic.

Iversen was co-founder of the Finnish Peace Union in 1920 (Finnish: Suomen Rauhanliitto, Swedish: Finlands Fredsförbund, English: Peace Union of Finland) and its president from 1926 to 1968. He played a leading role in the peace movement and was also active in various other related organizations. He was Vice President of the World Association of Societies for the United Nations . In 1954 he received the International Stalin Prize for Strengthening Peace between Nations .

literature

  • Gustav Elfving : The history of mathematics in Finland 1828–1918 . Societas Scientiarium Fennica, Helsinki, 1981; Pp. 175-178.
  • Iversen, Felix in Uppslagsverket Finland

Individual evidence

  1. ^ Felix Iversen: Recherches sur les fonctions inverses des fonctions méromorphes , Helsingfors, 1914
  2. ^ R. Nevanlinna , Unambiguous analytical functions , Springer-Verlag, 1953; P. 291
  3. ^ AA Goldberg , IV Ostrovskii : Distribution of values ​​of meromorphic functions , American Mathematical Society, 2008; P. 171 (Russian original: Moscow, Nauka 1970)
  4. ^ R. Nevanlinna , Unambiguous analytical functions , Springer-Verlag, 1953; P. 289
  5. ↑ the website of the organization contains a short history, with a picture of Iversen
personal data
SURNAME Iversen, Felix
ALTERNATIVE NAMES Iversen, Felix Christian Herbert (full name)
BRIEF DESCRIPTION Finnish mathematician
DATE OF BIRTH October 22, 1887
PLACE OF BIRTH Lübeck
DATE OF DEATH July 31, 1973
Place of death Helsinki