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A comment on Donald Knuth's letter about teaching O notation in calculus classes. Parent comment

Re:Donald Knuth's letter about teaching O notation in calcul... by rms on Tuesday April 15, 2008 @03:00AM (#163902)
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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