= Peter Gustav Lejeune Dirichlet
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A <mathematician> associated with the <Dirichlet problem>.
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{title=Portrait of <Peter Gustav Lejeune Dirichlet>}
{description=Unknown artist; portrait dated before 1859; Commons upload by Magnus Manske. Public domain asserted by Commons in origin and life-plus-70 jurisdictions. https://commons.wikimedia.org/wiki/Template:PD-old-70[Source usage terms], via Wikimedia Commons.}
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