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Dec 15, 2014 at 13:36 comment added Pietro Majer We always learn by students. Not really in the topic, but I need to tell this recent one. A student showed me a couple of exercises on limits he had done (a bit worried). "Is it 1?" "Correct!" I said. "And this one? I got -2..." "Correct too, very good" said I. And he... "But isn't this in contradiction with the principle of uniqueness of the limit?".
Dec 15, 2014 at 6:56 comment added Steven Landsburg @quid: Well, of course. The Greeks were very primitive and had not yet discovered the letter $h$.
Dec 15, 2014 at 6:49 comment added user9072 Of course the Greek method uses a $\Delta$ rather than an $h$.
S Dec 14, 2014 at 23:25 history answered Steven Landsburg CC BY-SA 3.0
S Dec 14, 2014 at 23:25 history made wiki Post Made Community Wiki by Steven Landsburg