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Kenneth Rosen Edition 7 Exercise 2.3 Question 15 (Page No. 153)

in Set Theory & Algebra
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Determine whether the function $f: Z \times Z  \rightarrow Z$ is onto if

  1. $f(m,n) = m+n$
  2. $f(m,n) = m^2+n^2.$
  3. $f(m,n) = m.$
  4. $f(m,n) = |n|.$
  5. $f(m,n) = m-n.$
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