Peter Gustav Lejeune Dirichlet, German mathematician and academic (died 1859)

Peter Gustav Lejeune Dirichlet

German mathematician (1805–1859)

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…