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Define J : Q ? Q ? R by the rule J (r, s) = r +?2*s for all (r, s) ? Q ? Q.

Define J : Q Ã? Q ? R by the rule J (r, s) = r +?2*s for all (r, s) ? Q Ã? Q. a. Is J one-to-one? Prove or give a counterexample. b. Is J onto? Prove or give a counterexample. 2. Prove that...

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