0 votes 0 votes Determine whether $f$ is a function from $Z$ to $R$ if $f(n) = +-n.$ $f(n) = \sqrt{n^2+1}.$ $f(n) = 1/(n^2-4).$ Set Theory & Algebra kenneth-rosen discrete-mathematics set-theory&algebra + – Pooja Khatri asked Apr 9, 2019 Pooja Khatri 268 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.