→ Sfly :note that a1-a2+a3-a4+..-a_2n is bounded by a1 10/16 20:20
這是99年台大推甄的題目，想好久不知道可以怎麼做，請求各位大大幫忙
Let {a_n} be a decreasing positive sequence. Assume that the series
Σ(a_n) diverge. Show that
a_1+a_3+...+a_2n-1
lim ---------------------=1
n->∞ a_2+a_4+...+a_2n
感謝大大的幫忙~~
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