Edmond Nicolas Laguerre (9 April 1834, Bar-le-Duc – 14 August 1886, Bar-le-Duc) was a French mathematician and a member of the Académie des sciences (1885). His main works were in the areas of geometry and complex analysis. He also investigated orthogonal polynomials (see Laguerre polynomials). Laguerre's method is a root-finding algorithm tailored to polynomials. He laid the foundations of a geometry of oriented spheres (Laguerre geometry and Laguerre plane), including the Laguerre transformation or transformation by reciprocal directions. Works Selection Théorie des équations numériques, Paris: Gauthier-Villars. 1884 on Google Books Oeuvres de Laguerre publ. sous les auspices de l'Académie des sciences par MM. Charles Hermite, Henri Poincaré, et Eugène Rouché. (Paris, 1898-1905) (reprint: New York : Chelsea publ., 1972 ) Extensive lists More than 80 articles on Nundam.org.p See also Isotropic line q-Laguerre polynomials Big q-Laguerre polynomials Discrete Laguerre polynomials Gauss–Laguerre quadrature Laguerre-Gaussian modes Laguerre form Laguerre formula Laguerre group Laguerre's method Laguerre–Pólya class Laguerre plane Laguerre polynomials Laguerre transform Laguerre transformations Laguerre's theorem Laguerre–Forsyth invariant Laguerre–Samuelson inequality Laguerre–Voronoi diagram References "Nécrologie". In: Nouvelles annales de mathématiques, 3rd series, vol. 8 (1889), p. 494–496—Obituary External links 1834 births 1886 deaths People from Bar-le-Duc École Polytechnique alumni Academic staff of the Collège de France Members of the French Academy of Sciences 19th-century French mathematicians