4. Let R be an integral domain having field of fractions F (a) Define i: R→ F by i(a) = [(a, 1)]. Prove i is a ring monomorphism (i.e., a one-to-one ring homomorphism) (b) Describe the field of fractions of the following three integral domains (no proof is required) Z[x], Z[i], F (where F is any field)

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