Ideals and factor rings

Let W:R->R' be a ring homomorphism and let N be an ideal of R. show that W[N] is an ideal of ImW.

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Originally Posted by Ryan0710

Let W:R->R' be a ring homomorphism and let N be an ideal of R. show that W[N] is an ideal of ImW.

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Just do it by definition. You need to show that if and then .