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  1. Johann Peter Gustav Lejeune Dirichlet (German: [ləˈʒœn diʁiˈkleː]; 13 February 1805 – 5 May 1859) was a German mathematician. In number theory, he proved special cases of Fermat's last theorem and created analytic number theory.

  2. Peter Gustav Lejeune Dirichlet was a German mathematician who made valuable contributions to number theory, analysis, and mechanics. He taught at the universities of Breslau (1827) and Berlin (1828–55) and in 1855 succeeded Carl Friedrich Gauss at the University of Göttingen.

    • The Editors of Encyclopaedia Britannica
  3. May 5, 2012 · Lejeune Dirichlet is best known for his proof that in any arithmetic progression with first term coprime to the difference there are infinitely many primes.

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  5. 1. Introduction. The great advances of mathematics in Germany during the first half of the nine-teenth century are to a predominantly large extent associated with the pioneering work of C.F. Gauß (1777–1855), C.G.J. Jacobi (1804–1851), and G. Lejeune Dirich-let (1805–1859).

  6. Johann Peter Gustav Lejeune Dirichlet (1805-1859) was a Belgian-born mathematician, noted for his work in algebraic number theory. He invented the algebraic structure known as an “ideal,” so fundamental in ring theory, and is also considered the founder of the theory of Fourier series.

  7. Johann Peter Gustave Lejeune Dirichlet1805-1859 German Mathematician Lejeune Dirichlet was a professor at the University of Berlin prior to accepting a chair—previously held by Carl Gauss (1777-1855)—at the University of Göttingen.

  8. Johann Peter Gustav Lejeune Dirichlet was a German mathematician. In number theory, he proved special cases of Fermat's last theorem and created analytic number theory. In analysis, he advanced the theory of Fourier series and was one of the first to give the modern formal definition of a function.

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