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6. A function f : Z Z Z is defined as f (m,n) = 3n 4m. Verify whether this function is injective and whether it
6. A function f : Z Z Z is defined as f (m,n) = 3n 4m. Verify whether this function is injective and whether it is surjective.
8. A function f : ZZ ZZ is defined as f (m,n) = (m+ n,2m+ n). Verify whether this function is injective and whether it is surjective.
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