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<a accesskey="1" href="page.php?w=calculus&amp;p=2">1.Previous</a><br />
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<p><a href="page.php?w=mathematical_limit">mathematical limit</a>. </p>

<p>Calculus is the "mathematical backbone" for solving problems in which variable quantities change with time or another reference value. It has also been called "the basic instrument of <a href="page.php?w=physical_science">physical science</a>".</p>

<p>In the late 17th century, <a href="page.php?w=Isaac_Newton">Isaac Newton</a> and <a href="page.php?w=Gottfried_Wilhelm_Leibniz">Gottfried Wilhelm Leibniz</a> each independently formulated infinitesimal calculus. Later work,</p><p>
<a accesskey="1" href="page.php?w=calculus&amp;p=2">1.Previous</a><br />
<a accesskey="3" href="page.php?w=calculus&amp;p=4">3.Next</a>
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