0 votes 0 votes Determine whether $f: Z \times Z \rightarrow Z$ is onto if $f(m,n) = 2m-n.$ $f(m,n) = m^2-n^2.$ $f(m,n) = m+n+1.$ $f(m,n) = |m|-|n|.$ $f(m,n) = m^2-4.$ Set Theory & Algebra kenneth-rosen discrete-mathematics set-theory&algebra + – Pooja Khatri asked Apr 9, 2019 Pooja Khatri 147 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.