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Apr 6, 2015 at 19:34 vote accept Dominic van der Zypen
Apr 8, 2015 at 7:05
Apr 6, 2015 at 19:11 comment added Bjørn Kjos-Hanssen $\omega=\{0,1,2,\dots\}$ so $a_i$ are nonnegative
Apr 6, 2015 at 19:03 history answered Richard Stanley CC BY-SA 3.0