Thanks to Michael Boldt for these links

<h3>  Lecture slides for March 10:</h3>
<ul>
<li>
<a href="Mar10.pdf"
>"Mar10.pdf"</a>.

</ul>

<h3> Paper containing the concentric ring example used in the presentation</h3>

<ul>
<li>
<a href="../PAPERS/ng01spectral.pdf"
   >"../PAPERS/ng01spectral.pdf"</a>

</ul>