Tức với mọi tập $a_{i}$ thì :
$\sum^{n}_{k = 1} \dfrac {1}{a_i} \leq \sum^{n}_{k = 1} \dfrac {1}{r_i} < 1.$
Edited by gadget, 04-09-2008 - 11:51.
Edited by gadget, 04-09-2008 - 11:51.
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