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<a accesskey="1" href="page.php?w=point_(geometry)&amp;p=15">1.Previous</a><br />
<a accesskey="3" href="page.php?w=point_%28geometry%29&amp;p=17">3.Next</a>
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<p>Often in physics and mathematics, it is useful to think of a point as having non-zero mass or charge (this is especially common in <a href="page.php?w=classical_electromagnetism">classical electromagnetism</a>, where electrons are idealized as points with non-zero charge). The <b>Dirac delta function</b>, or <b> function</b>, is (informally) a <a href="page.php?w=generalized_function">generalized function</a> on the real number line that is zero everywhere except at zero, with an <a href="page.php?w=integral">integral</a> of one over the entire</p><p>
<a accesskey="1" href="page.php?w=point_(geometry)&amp;p=15">1.Previous</a><br />
<a accesskey="3" href="page.php?w=point_%28geometry%29&amp;p=17">3.Next</a>
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