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Sigma KEE - Set
KB Term: 
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
集合
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 elementSet 是相同的。第二,一个 Set 可以是一堆随意组成的东西。这就是说 Set 不需要具有确定 其成员资格的相关联条件。注:我们并没有假设每个 Set 为独一无二的集合,即是说一个 Set 的组员可以在那个 Set 出现超过一次。
Relationships      
Parents 集或类 The SetOrClass of Sets and Classes, i.e. any instance of Abstract that has elements or instances.
Children 有限集合A Set containing a finite number of elements.
 非空集Any Set that has at least one element.
 空集Any Set that contains no elements.
 方程组A Set of equations


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