<?xml version="1.0" encoding='utf-8'?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" "http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<card id="card1" title="Fourier transform - Page 19 - Wikipedia">
<p>
<a accesskey="1" href="page.php?w=Fourier_transform&amp;p=18">1.Previous</a><br />
<a accesskey="3" href="page.php?w=Fourier_transform&amp;p=20">3.Next</a>
</p>
<p>instead of a proper Lebesgue integral, but sometimes for convergence one needs to use <a href="page.php?w=weak_limit">weak limit</a> or <a href="page.php?w=Cauchy_principal_value">principal value</a> instead of the (pointwise) limits implicit in an improper integral.  and  each gives three rigorous ways of extending the Fourier transform to square integrable functions using this procedure.  A general principle in working with the  Fourier transform is that finite linear combinations of Gaussians are dense in , and the various features of the</p><p>
<a accesskey="1" href="page.php?w=Fourier_transform&amp;p=18">1.Previous</a><br />
<a accesskey="3" href="page.php?w=Fourier_transform&amp;p=20">3.Next</a>
</p>

<do type="prev" label="Search">
        <go href="search.wml"/>
</do>

</card>
</wml>
