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Roland Bacher
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The closure of this set is exactly the set of all real numbers whose continued fraction expansions involve only different numbers. This last set is a Kantor set. By the way this last set is also the closure of all real numbers whose continued fraction is a permutation of $\mathbb N$ with finite support (moving only a finite number of elements).

Roland Bacher
  • 17.9k
  • 3
  • 45
  • 113