(2)If R*(X) = and R*(X) ≠ U, X is called an indefinable set in R. In this case, it is possible to determine that if some elements of U belong to but not if any element of U belongs to .
(3)If R*(X) ≠ and R*(X) = U, X is called an outside indefinable set of R. In this case, it is possible to determine whether some elements of U belong to X but not ...
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