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    Commutative ring proof

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    Let R be a commutative ring with 1. Prove that if (a,b)=1 and a divides bc, then a divides c. More generally, show that if a divides bc with nonzero a,b then a/(a,b) divides c. (Here (a,b) denotes the g.c.d. of a and b).

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    Solution Summary

    This provides an example of a proof with a commutative ring.