I tried several sets, but I could not find such set. Someone advised me to set V to be an union of intervals which are deleted in odd steps of SVC set. Then he said closure of V is the set I wanted. But I cannot understand. Can you help me?
closed as too localized by Igor Rivin, Willie Wong, Benoît Kloeckner, Alain Valette, Martin Brandenburg Nov 18 2011 at 15:16