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Rudolf Lipschitz

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Rudolf Otto Sigismund Lipschitz was a German mathematician who made contributions to mathematical analysis and differential geometry, as well as number theory, algebras with involution and classical mechanics.

Rudolf Lipschitz

Peter Gustav Lejeune Dirichlet

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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. In mathematical physics, he studied potential theory, boundary-value problems, and heat diffusion, and hydrodynamics.

Peter Gustav Lejeune Dirichlet

Dirichlet was married in 1832 to Rebecka Mendelssohn. They had two children, Walter (born 1833) and Flora (born 1845). Drawing by Wilhelm Hensel, 1823