[Everyday Mathematics]20150303
2015-01-26 08:39
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设 $f$ 是 $\bbR$ 上的 $T$ - 周期函数, 试证: $$\bex \int_T^\infty\frac{f(x)}{x}\rd x\mbox{ 收敛 } \ra \int_0^T f(x)\rd x=0. \eex$$
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