Here’s the link to the article and the follow up articles that resulted from his suggestion at the end that teachers stop “saying that multiplication is repeated addition,” one of my own pet peeves.
“What Is Conceptual Understanding?”
http://www.maa.org/external_archive/devlin/devlin_09_07.html“It Ain't No Repeated Addition”
http://www.maa.org/external_archive/devlin/devlin_06_08.html“It's Still Not Repeated Addition”
http://www.maa.org/external_archive/devlin/devlin_0708_08.html“Multiplication and Those Pesky British Spellings”
http://www.maa.org/external_archive/devlin/devlin_09_08.html“What Exactly Is Multiplication?”
http://www.maa.org/external_archive/devlin/devlin_01_11.html