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[数论] 积性函数等于两个函数之积,则它们都是积性函数吗

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hbghlyj posted 2024-3-15 23:10 |Read mode
两个函数$f_1,f_2:\Bbb N_+\to\Bbb N_+$之积为积性函数,则它们都是积性函数吗?

来源:是Product of Multiplicative Functions is Multiplicative的逆命题。不知是否成立。

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