For any n> 1, let (n) be the number of positive integers a

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For any n > 1, let o(n) be the number of positive integers a < n with gcd(a, n) = 1. This
function is called the totient function.
(a) Prove that if n = pq is the product of two distinct primes, o(n) = (p − 1)(q − 1)
(b) Prove that if p is prime, (p²) = p(p − 1).
Transcribed Image Text:For any n > 1, let o(n) be the number of positive integers a < n with gcd(a, n) = 1. This function is called the totient function. (a) Prove that if n = pq is the product of two distinct primes, o(n) = (p − 1)(q − 1) (b) Prove that if p is prime, (p²) = p(p − 1).
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