<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Chebyshev(1) is actually just Richardson. </blockquote><div><br></div><div> Damped Richardson, with, for instance, the/an optimal damping for "the model problem".</div><div><br></div></div></div></div>