relative complement; set difference
Mathematical term for the set of elements in one set that are not in another. Often written as A \ B or A − B.
The relative complement of set A and set B is the set of all elements that belong to A but not to B.
Intersection of sets, containing only elements common to both sets.
Complement of a set, usually relative to a universal set.
Compound of 差 (difference) and 集合 (set), a direct translation of the mathematical concept.