[分析] 能否構造出滿足以下條件的函數序列
Is it possible to construct a sequence {f_i} of continuous functions
such that ( f_i:|R—>|R )
(i) f_i ≧ 0 for all i .
(ii) { x ∣ lim inf f_n(x) = ∞ } = Q ( all rational numbers in |R )
n->∞
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