Question: Determine whether the function f : Z Z Z is onto if a) f (m, n) = m + n. b) f (m,

Determine whether the function f : Z × Z → Z is onto if
a) f (m, n) = m + n.
b) f (m, n) = m2 + n2.
c) f (m, n) = m.
d) f (m, n) = |n|.
e) f (m, n) = m − n.

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