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<p>of three or more functions, to a rule for higher-order derivatives of a product, and to other contexts.</p>

<p><big> Discovery </big></p>
<p>Discovery of this rule is credited to <a href="page.php?w=Gottfried_Leibniz">Gottfried Leibniz</a>, who demonstrated it using <a href="page.php?w=Nonstandard_calculus">"infinitesimals"</a> (a precursor to the modern <a href="page.php?w=differential_%28calculus%29">differential</a>). (However, J. M. Child, a translator of Leibniz's papers, argues that it is due to <a href="page.php?w=Isaac_Barrow">Isaac Barrow</a>.)</p><p>
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