2 votes 2 votes Let $S = \{x \in R : 1 \leq |x| \leq 100\}$. Find all subsets $M$ of $S$ such that for all $x, y$ in $M$, their product $xy$ is also in $M$. Set Theory & Algebra descriptive isi2013 set-theory + – go_editor asked May 31, 2016 go_editor 408 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.