閉へい包ほう

noun

closure

Mathematical term: the smallest closed set containing a given set, or the operation that produces it.

• 集しゅう合ごうAの閉へい包ほうは、Aを含ふくむ最さい小しょうの閉へい集しゅう合ごうである。

  The closure of set A is the smallest closed set containing A.