A sequence {a1,a2..} is called s superincreasing sequence if (1) a1>0
and (2) ai > i-1
Σ aj for i =2,3..Let {m1,m2..}be a superincreasing sequence,
j=1 n i
use maathematical induction to show that Σ(mi/ Σmj)≧1/2(n+1)
i=1 j=1
這題有個地方求解時轉不過來，請問有人可以解釋嗎？謝謝。
1-(mk+1/ k+1 ) 2*(mk+1/ k+1 ) > 2
Σ mj 怎麼變成 Σ mj
j=1 j=1
一直想不透這地方說~
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