Émile Picard

Émile Picard

Charles Émile Picard

(1856-07-24)24 July 1856
Died11 December 1941(1941-12-11) (aged 85)
Paris, France
Alma materÉcole Normale Supérieure (Paris)
Known forPicard functor
Picard group
Picard horn
Picard modular group
Picard modular surface
Picard theorem
Picard variety
Picard–Lefschetz formula
Picard–Lindelöf theorem
Picard–Vessiot theory
Picard–Fuchs equation
Painlevé transcendents
AwardsForMemRS (1909)
Poncelet Prize (1886)
Scientific career
InstitutionsUniversity of Paris
École Centrale Paris
ThesisApplications des complexes lineaires a l'etude des surfaces et des courbes gauches
Doctoral advisorGaston Darboux
Doctoral studentsSergei Bernstein
Paul Dubreil
Jacques Hadamard
Gaston Julia
Traian Lalescu
Philippe Le Corbeiller
Paul Painlevé
Mihailo Petrović
Simion Stoilow
Ernest Vessiot
Henri Villat
André Weil
Stanisław Zaremba

Charles Émile Picard FRS(For) FRSE (French: [ʃaʁl emil pikaʁ]; 24 July 1856 – 11 December 1941) was a French mathematician. He was elected the fifteenth member to occupy seat 1 of the Académie française in 1924.


He was born in Paris on 24 July 1856 and educated there at the Lycée Henri-IV. He then studied mathematics at the École Normale Supérieure.

Picard's mathematical papers, textbooks, and many popular writings exhibit an extraordinary range of interests, as well as an impressive mastery of the mathematics of his time. Picard's little theorem states that every nonconstant entire function takes every value in the complex plane, with perhaps one exception. Picard's great theorem states that an analytic function with an essential singularity takes every value infinitely often, with perhaps one exception, in any neighborhood of the singularity. He made important contributions in the theory of differential equations, including work on Picard–Vessiot theory, Painlevé transcendents and his introduction of a kind of symmetry group for a linear differential equation. He also introduced the Picard group in the theory of algebraic surfaces, which describes the classes of algebraic curves on the surface modulo linear equivalence. In connection with his work on function theory, he was one of the first mathematicians to use the emerging ideas of algebraic topology. In addition to his theoretical work, Picard made contributions to applied mathematics, including the theories of telegraphy and elasticity. His collected papers run to four volumes.

Louis Couturat studied integral calculus with Picard in 1891-1892, taking detailed notes of the lectures. These notes were preserved and now are available in three cahiers from Internet Archive.

Like his contemporary, Henri Poincaré, Picard was much concerned with the training of mathematics, physics, and engineering students. He wrote a classic textbook on analysis and one of the first textbooks on the theory of relativity. Picard's popular writings include biographies of many leading French mathematicians, including his father in law, Charles Hermite.


In 1881 he married Marie, the daughter of Charles Hermite.


Charles Émile Picard was one of the founder members in 1930 of the Society of Friends of André-Marie Ampère which was created to develop the first science museum in France, the Ampère Museum close to Lyons.


See also

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