To prove: The identity ϕ ( n ) = n ∏ i = 1 k ( 1 − 1 p i ) , where ϕ ( n ) = { k : 1 ≤ k ≤ n , GCD { k , n } = 1 } .

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Chapter 6, Problem 32E

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To prove: The identity ϕ(n)=n∏i=1k(1−1pi), where ϕ(n)={k:1≤k≤n,GCD{k,n}=1}.

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