12. Suppose o: R = R' is a ring homomorphism of a ring with unity, R, onto a non-zero ring R'. Let u be a unit in R. Pro
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12. Suppose o: R = R' is a ring homomorphism of a ring with unity, R, onto a non-zero ring R'. Let u be a unit in R. Pro
12. Suppose o: R = R' is a ring homomorphism of a ring with unity, R, onto a non-zero ring R'. Let u be a unit in R. Prove that (u) is a unit in R'. a
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