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= a (mod n) is a ring homomorphism. (10) Suppose that o Z Z defined by ¢(a) (a) (5 Pts) Prove that o is injective. Answer(b) (5 Pts) Prove that o is surjective onto its image. Answer

= a (mod n) is a ring homomorphism. (10) Suppose that o Z Z defined by ¢(a) (a) (5 Pts) Prove that o is injective. Answer
(b) (5 Pts) Prove that o is surjective onto its image. Answer
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Answer #1

a) a (modn) b PYove tit b njective Homo Saludm bmodr) (upow) \a-1) nE kerf kerfo maf on-o Sjedne ondo mage a-n Jndey a (modn)

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