Last Updated
：2025/11/20
proper subset
Noun
Japanese Meaning
真部分集合：集合論において、ある集合の全てまたは一部の要素から構成される集合だが、元の集合と全く同じではないもの。 / 固有部分集合：元の集合の部分集合でありながら、元の集合全体とはならないもの。
（ plural ）
Quizzes for review
(set theory) a set that is a subset of the set, but not equal to it.
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proper subset
If A is a proper subset of B, then every element of A is also in B, but B has at least one element not in A.
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If A is a proper subset of B, then every element of A is also in B, but B has at least one element not in A.
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