1. The problem statement, all variables and given/known data Let [tex]Q[/tex] be the set of all rational numbers Prove [tex]bd(Q)=R[/tex] 2. Relevant equations 3. The attempt at a solution Let x be a real number, then since the interval |x-r| contains both rationals and irrationals for arbitrary small r, so R is the boundary of Q. Is that right?