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试证明: 设{Ek}是Rn中递增可测集列,且Ek→E(k→∞).若f(x)是E上非负可测函数,则 .
试证明:
设{Ek}是Rn中递增可测集列,且Ek→E(k→∞).若f(x)是E上非负可测函数,则
.
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试证明:
设{Ek}是Rn中递增可测集列,且Ek→E(k→∞).若f(x)是E上非负可测函数,则
.
(i)χEk(x)在Rn上依测度收敛到0当且仅当m(Ek)→0(k→∞);
(ii)χEk(x)在Rn上几乎处处收敛到0当且仅当.