= Joseph-Louis Lagrange
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{title2=1736–1813}
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<Joseph-Louis Lagrange> was a <mathematician> whose work transformed <analysis>, <number theory> and <classical mechanics>. His correspondence with <Leonhard Euler> helped develop the <calculus of variations>, and his later analytical treatment of <mechanics> organized equations of motion through generalized coordinates.https://mathshistory.st-andrews.ac.uk/Biographies/Lagrange/[Biography, early variational work and analytical mechanics]{ref} In <Lagrangian mechanics>, a function of position and velocity leads to the <Euler-Lagrange equation>, giving a systematic way to handle constrained motion. His name also appears in the <Lagrange multiplier> method and <Lagrange's four-square theorem>, illustrating the breadth of his contributions across continuous and discrete <mathematics>.
<Mathematician>.
Biography: https://mathshistory.st-andrews.ac.uk/Biographies/Lagrange/
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{title=Portrait of <Joseph-Louis Lagrange>}
{description=Zéphirin Belliard (1798–1871), lithograph; Wellcome Library, London / Wellcome Images, L0016620, library reference ICV 3511. https://creativecommons.org/licenses/by/4.0/[Creative Commons Attribution 4.0 International.], via Wikimedia Commons.}
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