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Oct 19, 2012 at 18:54 comment added Misha epsilon-delta: No, everything is correct, my number $r$ is the Lebesgue number of the covering described by dcs34. See en.wikipedia.org/wiki/Lebesgue's_number_lemma
Oct 19, 2012 at 17:40 comment added ε-δ Your first sentence is incorrect; it seems you use a definition different from the one given by dcs24.
Oct 17, 2012 at 21:36 comment added dcs24 A very nice proof indeed. Thank you for your help.
Oct 17, 2012 at 21:33 vote accept dcs24
Oct 17, 2012 at 18:21 history answered Misha CC BY-SA 3.0