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Something wrong?Dirichlet gave mathematics one of its most fundamental tools: the modern definition of a function. Before him, the concept was loose and intuitive; he made it rigorous, a move that quietly underpins every equation since.
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Göttinger Gedenktafel - Dirichlet, P. G. Lejeune, 1, Mühlenstraße 1, Innenstadt, Göttingen, Landkreis Göttingen
Lejeune-Dirichlet, Peter Gustav Lejeune-Dirichlet - G. Lejeune Dirichlet's Werke, 1889 - BEIC IE1671234 Lejeune-Dirichlet Peter Gustav
Peter Gustav Lejeune Dirichlet
Weierstr. 11
קברו של דיריכלהIn their own words 1
, The University of Berlin had been greatly influenced by the successful French research institutes, such as the Ecole Polytechnique, that had been founded by Napoleon.
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Born Johann Peter Gustav Lejeune Dirichlet on 13 February 1805 in Germany, he entered mathematics at a time when many of its core ideas still lacked formal structure. He proved special cases of Fermat's Last Theorem and in doing so created analytic number theory, a field that applies the tools of calculus to questions about whole numbers. He advanced Fourier series, the method of breaking complex waves into simple components, and was among the first to define a function in the precise way now taught in every textbook. His work ranged into mathematical physics - potential theory, boundary-value problems, heat diffusion, hydrodynamics - problems of motion and flow that required new rigor. He died on 5 May 1859, his surname a mouthful, his mononym attached to theorems still in use.
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