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kf
on April 15, 2008
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Donald Knuth's letter about teaching O notation in...
This textbook teaches calculus using the infinitesimal approach. To do rigorous infinitesimal calculus, you have to define the hyperreal number system.
http://theassayer.org/cgi-bin/asbook.cgi?book=770
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http://theassayer.org/cgi-bin/asbook.cgi?book=770