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Relation: subclass

direct-childrendocumentationgraph
Set4这是个 SetOrClass 能满足延伸性和由集合理论的某些选择所指定 的其他约束。Set 在两个重要方面与 Classes 不同：第一，Sets 是可以延伸的 - 两个拥有一样 &...^
    NullSet.任何没有实例的 SetOrClass^

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