0 votes 0 votes Use question $25$ to provide a proof different from that in the text that the set of rational numbers is countable. [Hint: Show that you can express a rational number as a string of digits with a slash and possibly a minus sign.] Set Theory & Algebra kenneth-rosen discrete-mathematics set-theory&algebra descriptive + – admin asked Apr 21, 2020 admin 258 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.