Thirteen Ways of Looking at Multiplication (with apologies to Wallace Stevens)

Well, no, I’ve lied: not thirteen, but merely four ways of looking at (and
doing) multiplication are contained herein. And I hope to convince you that
th...
5 hours ago
no proof, but here's some prime numbers in a spiral. http://www.flickr.com/photos/modern_carpentry/3896432339/in/set72157622057420172/
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