Michel Plancherel

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From left, standing: Annibale Comessatti , Dr. Ernst Völlm (Zurich), Michel Plancherel at the International Congress of Mathematicians , Zurich 1932

Michel Plancherel (born January 16, 1885 in Bussy ( Switzerland ), † March 4, 1967 in Zurich ) was a Swiss mathematician . He was rector of the ETH Zurich from 1931 to 1935. In the Swiss army he had the officer rank of colonel.

Life

From 1903 to 1907 he studied mathematics at the University of Freiburg . Then he went to Göttingen and Paris . In 1910 he became a private lecturer at the University of Geneva , in 1911 he became a professor in Freiburg and from 1920 at the ETH Zurich .

Plancherel worked in the fields of analysis , mathematical physics and algebra . Plancherel's theorem from harmonic analysis, named after him, is well known . The Plancherel measure is named after Plancherel and is used in the generalization of Plancherel's theorem in non-commutative harmonic analysis.

At the same time as Arthur Rosenthal in 1913 he proved the impossibility of existence in the strict sense of ergodic mechanical systems (that is, dynamic systems in which the trajectory of the solution runs through every point in phase space on the energy surface).

At the beginning of the Second World War , Plancherel worked as a colonel in the inspectorate and in the legal service of the press and radio communications department. Later from mid-1942 until the end of the war he headed the press and radio communications department.

Plancherel was married to Cécile Tercier, had nine children and was chairman of the Mission Catholique Française in Zurich. He was a member of the Catholic student union AV Turicia in the Schw. StV.

Web links

Individual evidence

  1. ↑ Urs Stammbach: Michel Plancherel. In: Historical Lexicon of Switzerland . November 14, 2008 , accessed May 22, 2017 .
  2. ↑ Plancherel, Michel (1910) "Contribution a l'etude de la representation d'une fonction arbitraire par les integrales définies," Rendiconti del Circolo Matematico di Palermo , vol. 30, pages 298-335.
  3. ↑ Stephen Brush Proof of the Impossibility of Ergodic Systems: The 1913 Papers of Rosenthal and Plancherel , Transport Theory and Statistical Physics, Vol. 1, 1971, pp. 287-311. With English translation of the work of Rosenthal and Plancherel. online (PDF)
  4. ^ Georg circle : censorship and self-censorship. Swiss press policy in the Second World War . Huber, Frauenfeld and Stuttgart 1973, p. 48 .
personal data
SURNAME Plancherel, Michel
BRIEF DESCRIPTION Swiss mathematician
DATE OF BIRTH January 16, 1885
PLACE OF BIRTH Bussy , Switzerland
DATE OF DEATH March 4th 1967
Place of death Zurich