Set | *documentation* A Class that satisfies extensionality as well as other conditions specified by some choice of set theory. Unlike Classes generally, Sets need *not* have an associated condition that determines their membership. Rather, they are thought of metaphorically as `built up' from some initial stock of objects by means of certain constructive operations (such as the pairing or power set operations). Note that extensionality alone is not sufficient for identifying Classes with Sets, since some Classes (e.g. Entity) cannot be assumed to be Sets without contradiction | |

**is first ***domain* of subset | |

**is second ***domain* of *element* | |

**is second ***domain* of subset | |

**is a kind of** Class | |

Class | **has axiom** (<=> (instance ?CLASS Class) (subclass ?CLASS Entity))
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**has axiom** (forall (?INT) (*domain* *disjointDecomposition* ?INT Class))
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**has axiom** (forall (?INT) (*domain* *exhaustiveDecomposition* ?INT Class))
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**is third ***domain* of *domain* | |

**is third ***domain* of *domainSubclass* | |

Abstract | **is ***disjoint* from Physical | |