proof:note that
{-∞<X<=b}={-∞<X<=a}U{a<x<b}
The proof of the result follows immediately because the union on the right
side of this equation is a disjoint union.
说道disjoint union 就证明出来了?能不能具体的讲一下怎莫出来的呢?谢谢

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楼主: chasedreamtrue
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一道简单的theorem证明 |
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