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<p>and <a href="page.php?w=algebraic_topology">algebraic topology</a>.</p>

<p><big> Introduction </big></p>
<p>The term <b>differential</b> is used nonrigorously in <a href="page.php?w=calculus">calculus</a> to refer to an <a href="page.php?w=infinitesimal">infinitesimal</a> ("infinitely small") change in some <a href="page.php?w=Variable_%28mathematics%29">varying quantity</a>. For example, if x is a <a href="page.php?w=Variable_%28mathematics%29">variable</a>, then a change in the value of x is often denoted ?x (pronounced <a href="page.php?w=Delta_%28Greek%29">delta</a></p><p>
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