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* COUNTABLE * Determine whether the function f : Z Z Z is onto in the following cases: a) f (m, n) = m +

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* COUNTABLE * Determine whether the function f : Z Z Z is onto in the following cases: a) f (m, n) = m + n. *b) f (m, n) = m2 + n2. c) f (m, n) = m. d) f (m, n) = Inl. e) f (m, n) = m - n. Your answer will be not just Yes/No; show your reasoning as well. BALES *

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