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From: James Dow Allen on 12 Feb 2010 15:24
On Feb 13, 2:39 am, James Dow Allen <jdallen2...(a)yahoo.com> wrote:
> On Feb 12, 4:55 pm, David Bernier <david...(a)videotron.ca> wrote:
> > <http://www.maa.org/editorial/euler/Dec2009.pdf>
>
> Thank you very much for this link!
> *Very* interesting ...
> It answers my question, and tells a fun story to boot.
> .
>     d(x^2) = 2 dx + (dx)^2 = 2 dx

Obviously intended
d(x^2) = 2xdx + (dx)^2 = 2xdx

'x' key on this keyboard has gone intermittent;
should have used 'y' :-) :-)

James
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