Web Reference: Johann Peter Gustav Lejeune Dirichlet (/ ˌdɪərɪˈkleɪ /; [1] German: [ləˈʒœn diʁiˈkleː]; [2] 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. Feb 9, 2026 · 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. 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. Lejeune Dirichlet's family came from the Belgium town of Richelet where Dirichlet's grandfather lived.
YouTube Excerpt: The Mathematical Genius of Gustav
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