Jisho

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さしゅうごう 差集合
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Noun
1. relative complement​Mathematics
Wikipedia definition
2. Complement (set theory)​In set theory, a complement of a set A refers to things not in (that is, things outside of), A. The relative complement of A with respect to a set B, is the set of elements in B but not in A. When all sets under consideration are considered to be subsets of a given set U, the absolute complement of A is the set of all elements in U but not in A.
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