or if you are asking if there is a procedure that

送交者: steven 于 2012-04-25, 19:48:59:

回答: there isn't such a condition, your question too ambiguous. 由 steven 于 2012-04-25, 19:41:34:

starting with the set of real number, and by eliminating some proper subset,s and it ends up with a countable set, and that is impossible, since real is not countable.

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