Peter Gustav Lejeune Dirichlet (1805–1859) was a prominent German mathematician known for his foundational contributions to number theory, analysis, and differential equations. He made significant advances in various areas of mathematics, particularly in the development of Dirichlet series and Dirichlet's theorem on arithmetic progressions.
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Portrait of Peter Gustav Lejeune Dirichlet
. Unknown artist; portrait dated before 1859; Commons upload by Magnus Manske. Public domain asserted by Commons in origin and life-plus-70 jurisdictions. Source usage terms, via Wikimedia Commons. Source.