Dionis

Achille Pierre Dionis du Séjour

Born: 11 Jan 1734 in Paris, France
Died: 22 Aug 1794 in Vernou (near Fontainebleau), France

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Dionis du Séjour published a treatise on the analytic geometry of plane curves in 1756 and wrote extensively on applications of mathematics to astronomy, in particular planetary orbits. He also worked on the theory of equations, not attaining the depth of results of Bézout or Lagrange. With Condorcet and Laplace he undertook a determination of the population of France.

References:

  1. Dictionary of Scientific Biography
  2. J Bertrand, l'Académie des sciences et les académiciens de 1666 à 1793 (Paris, 1869), 311-312. 
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JOC/EFR February 1996