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(set theory, of set A "in" set B) The set containing exactly those elements belonging to B but not to A.
Usage notes
In mathematical expressions, the relative complement of A in B is denoted B ∖ A according to the ISO 31-11 standard (sometimes written B − A, but this notation is ambiguous, as in some contexts it can be interpreted as the set of all b − a, where b is taken from B and a from A).
