James Demmel authored numerical-computation teaching material explaining why multigrid combines different error-reduction mechanisms. Frequency analysis separates the error rapidly damped by relaxation from components better handled on a coarser grid.[ref]
CS267: Supplemental Notes for Lecture 17 — How Multigrid Damps High Frequencies by James Demmel. author attribution and the described mathematical development
Portrait of James Demmel
. Derrick Coetzee (Dcoetzee); photographed 5 March 2010 in Demmel’s Berkeley Par Lab office; own work. CC0 1.0 Universal Public Domain Dedication. Source usage terms, via Wikimedia Commons. Source.
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