a) Explain why the multiplicativity of (n) follows from the formula p(n) = n* | (1 - 1/p) where the product runs over the prime factors of n.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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a) Explain why the multiplicativity of p(n) follows from the formula p(n) = n*
IL (1 - 1/p) where the product runs over the prime factors of n.
b) Prove this product formula for p(n) by induction on the number of prime-power factors of n, using as your base step the formula (from class)
p(p^k) = p^k - p^(k-1) for primes p.
Transcribed Image Text:a) Explain why the multiplicativity of p(n) follows from the formula p(n) = n* IL (1 - 1/p) where the product runs over the prime factors of n. b) Prove this product formula for p(n) by induction on the number of prime-power factors of n, using as your base step the formula (from class) p(p^k) = p^k - p^(k-1) for primes p.
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