- Let $[a,b]$ be a nonempty interval with irrational endpoints.
- Choose distinct irrational points $p,q\in(a,b)$
- Remove the subinterval $(p,q)$ from the initial interval $[a,b]$
- Repeat the process similar to the Cantor set process, choosing irrational endpoints at each stage.
Does the resultant set contain rational points?