真しん部ぶ分ぶん集しゅう合ごうしんぶぶんしゅうごうMeanings1nounproper subsetMathematical term: a subset that is strictly contained in another set, i.e., all elements of A are in B, but B has at least one element not in A.AがBの真ま部ぶ分ぶん集しゅう合ごうであるとき、A⊂Bと表あらわす
