Define J: Q × Q ? R by the rule J(r, s)= r + for all (r,
Chapter 7, Problem 30E(choose chapter or problem)
Problem 30E
Define J: Q × Q → R by the rule J(r, s)= r + for all (r, s)∈ Q × Q.
a. Is J one-to-one? Prove or give a counterexample.
b. Is J onto? Prove or give a counterexample.
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