Léopold Leau

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Léopold Leau
Leopold Leau.jpg
Scientific career

Léopold Leau (1868-1943) was a French mathematician,[1] primarily known for his ties to international auxiliary languages.

The Delegation for the Adoption of an International Auxiliary Language was founded on 7 January 1901 on Leau's initiative.[2] He co-wrote with Prof. Louis Couturat the monumental Histoire de la Langue Universelle (1903)[3] and its supplement Les Nouvelles Langues Internationales (1907).[4]

Leau studied at the École normal supérieure in Paris and received his doctorate there in April 1897.[5] Later he was a professor at the University of Nancy . There he was Dean of the Faculté des Sciences from 1931–34. In his dissertation, Leau examined, among other things, the iteration behavior of holomorphic functions in the environment of a rationally indifferent fixed point. His results are known today under the name (Leau-Fatou) Flower Theorem . They play an important role in the complex dynamics.


  1. ^ Audin, Michèle (2011), Fatou, Julia, Montel: The great prize of mathematical sciences of 1918, and beyond, Translated from the 2009 French original by the author, Lecture Notes in Mathematics, vol. 2014, Springer, Heidelberg, p. 97, doi:10.1007/978-3-642-17854-2, ISBN 978-3-642-17853-5, MR 2768955.
  2. ^ History of IDO, Union for the international language, archived from the original on 2016-03-03, retrieved 2014-07-15.
  3. ^ Müller, F. Max (July 1904). "Review: Histoire de la Langue Universelle by L. Couturat & L. Leau". The Monist. 14 (4): 604–607.
  4. ^ Koerner, E. F. K. (1974), "An Annotated Chronological Bibliography of Western Histories of Linguistic Thought, 1822-1972. Part I: 1822-1915", Historiographia Linguistica, 1 (1): 81–94, doi:10.1075/hl.1.1.06koe.
  5. ^ Die Dissertation Étude sur les équations fonctionnelles à une ou à plusieurs variables erschien in: Annales de la Faculté des sciences de Toulouse: Mathématiques, Série 1, Band 11 (1897), Heft 2, Seiten E.1-E.110. Digitalisat bei Numdam: Teil 1, Teil 2
  • Daniel S. Alexander: A history of complex dynamics: from Schröder to Fatou and Julia. (Aspects of Mathematics), Vieweg, Braunschweig 1994, ISBN 3-528-06520-6 . Chapter 5 describes Leau's contributions.