Exercise 3.6.3 Assume gcd(m, n)=1. Define f :Z→Z„ O Z„ by f(x)=(x+mZ, x+ nZ) and show that f(x+ y)=f(x) +f(y). Then show that, as additive groups, Zm Ð Z,n and Zmn are isomorphic – using the first isomorphism theorem from the preceding section.

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3.6.3

Exercise 3.6.3 Assume gcd(m, n) =1. Define f : Z→Z, O Z, by f(x)= (x+ mZ,x+ nZ)
and show that f(x+y) =f(x) +f(y). Then show that, as additive groups, Zm Ð Z, and
Zmn are isomorphic – using the first isomorphism theorem from the preceding section.
Transcribed Image Text:Exercise 3.6.3 Assume gcd(m, n) =1. Define f : Z→Z, O Z, by f(x)= (x+ mZ,x+ nZ) and show that f(x+y) =f(x) +f(y). Then show that, as additive groups, Zm Ð Z, and Zmn are isomorphic – using the first isomorphism theorem from the preceding section.
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