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 th
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
Siméon Denis Poisson
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Baron Siméon Denis Poisson was a French mathematician and physicist who worked on statistics, complex analysis, partial differential equations, the calculus of variations, analytical mechanics, electr
Peter Gustav Lejeune Dirichlet
…an exceptional feat for a 20-year-old student with no degree. His lecture at the Academy had also put Dirichlet in close contact with Fourier and Poisson, who raised his interest in theoretical physics, especially Fourier's analytic theory of heat. As General Foy died in November 1825 and he could not…
Siméon Denis Poisson
The name of Poisson (first from the right) inscribed on the Eiffel Tower
Poisson's 1804 portrait by E. Marcellot, now in the collection of the École Polytechnique.
Poisson's equations for electricity (top) and magnetism (bottom) in SI units on the front cover of an undergraduate textbook.