0 votes 0 votes Suppose that $A$ is a countable set. Show that the set $B$ is also countable if there is an onto function $f$ from $A$ to $B.$ Set Theory & Algebra kenneth-rosen discrete-mathematics set-theory&algebra descriptive + – admin asked Apr 21, 2020 • edited Apr 21, 2020 by Lakshman Bhaiya admin 217 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.