DLMF:27.3.E8 (Q8009)

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DLMF:27.3.E8
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    Defining formula
    ϕ ⁡ ( m ) ⁢ ϕ ⁡ ( n ) = ϕ ⁡ ( m ⁢ n ) ⁢ ϕ ⁡ ( ( m , n ) ) / ( m , n ) . Euler-totient-phi 𝑚 Euler-totient-phi 𝑛 Euler-totient-phi 𝑚 𝑛 Euler-totient-phi 𝑚 𝑛 𝑚 𝑛 {\displaystyle{\displaystyle\phi\left(m\right)\phi\left(n\right)=\phi\left(mn% \right)\phi\left(\left(m,n\right)\right)/\left(m,n\right).}}
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    DLMF id
    DLMF:27.3.E8
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