#(A)\times#(B) := #(A\cross B)
January 7, 2011 in Uncategorized
Devlin on multiplication. Again.
Joshua Fisher’s take on the bilinear functions approach at Republic of Mathematics; the key Number Warrior thread of May ’09.
Math doodles by Vi Hart. Wow.
Oh. George Hart‘s kid. That explains much.
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the livingston review 
January 11, 2012 at 10:02 am
http://numberwarrior.wordpress.com/2011/11/22/the-educational-problem-with-teaching-multiplication-as-repeated-addition/