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为什么证明里一会是 |
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公式中对i=1~s的s的定义未注明 是指互不相同的质因数个数,还是它的所有质因数个数 |
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互不相同的质因数个数不就等于的所有质因数个数吗? |
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上面的"比如说phi(1)=1"是否恰当? |
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关于证明 |
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https://oi-wiki.org/math/euler/
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