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</head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, sans-serif; "><div><br></div><div>From "Carpet Under the Hood":</div><div>"<span style="font-size: 10.000000pt; font-family: 'URWPalladioL'">For historic reasons it also has a notion of </span><span style="font-size: 10.000000pt; font-family: 'URWPalladioL'; font-style: italic">multigrid levels, </span><span style="font-size: 10.000000pt; font-family: 'URWPalladioL'">but those are currently unused. They might conceivably be reactivated to form multigrid stacks
to solve elliptic equations."</span></div><div><span style="font-size: 10.000000pt; font-family: 'URWPalladioL'"><br></span></div><div><span style="font-size: 10.000000pt; font-family: 'URWPalladioL'"><br></span></div><div><span style="font-size: 10.000000pt; font-family: 'URWPalladioL'">Yes, please. How soon?</span></div><div><span style="font-size: 10.000000pt; font-family: 'URWPalladioL'"><br></span></div><div><span style="font-size: 10.000000pt; font-family: 'URWPalladioL'"><br></span></div><div><span style="font-size: 10.000000pt; font-family: 'URWPalladioL'"><br></span></div><div><span style="font-size: 10.000000pt; font-family: 'URWPalladioL'"><br></span></div></body></html>