*equal* | *documentation* (*equal* ?ENTITY1 ?ENTITY2) is *true* just in case ?ENTITY1 is identical with ?ENTITY2 | |

**has domain1** Entity | |

**has domain2** Entity | |

**is an ***instance* of BinaryPredicate | |

**is an ***instance* of EquivalenceRelation | |

**is an ***instance* of RelationExtendedToQuantities | |

BinaryPredicate | **has axiom** (=> (*instance* ?REL BinaryPredicate) (*valence* ?REL 2))
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RelationExtendedToQuantities | **has axiom** (=> (*and* (*instance* ?FUNCTION RelationExtendedToQuantities) (*instance* ?FUNCTION BinaryFunction) (*instance* ?NUMBER1 RealNumber) (*instance* ?NUMBER2 RealNumber) (*equal* (*AssignmentFn* ?FUNCTION ?NUMBER1 ?NUMBER2) ?VALUE)) (forall (?UNIT) (=> (*instance* ?UNIT UnitOfMeasure) (*equal* (*AssignmentFn* ?FUNCTION (*MeasureFn* ?NUMBER1 ?UNIT) (*MeasureFn* ?NUMBER2 ?UNIT)) (*MeasureFn* ?VALUE ?UNIT)))))
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**has axiom** (=> (*and* (*instance* ?REL RelationExtendedToQuantities) (*instance* ?REL BinaryRelation) (*instance* ?NUMBER1 RealNumber) (*instance* ?NUMBER2 RealNumber) (*holds* ?REL ?NUMBER1 ?NUMBER2)) (forall (?UNIT) (=> (*instance* ?UNIT UnitOfMeasure) (*holds* ?REL (*MeasureFn* ?NUMBER1 ?UNIT) (*MeasureFn* ?NUMBER2 ?UNIT)))))
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BinaryRelation | **is first ***domain* of *DomainFn* | |

**is first ***domain* of *equivalenceRelationOn* | |

**is first ***domain* of *inverse* | |

**is first ***domain* of *irreflexiveOn* | |

**is first ***domain* of *partialOrderingOn* | |

**is first ***domain* of *RangeFn* | |

**is first ***domain* of *reflexiveOn* | |

**is first ***domain* of *totalOrderingOn* | |

**is first ***domain* of *trichotomizingOn* | |

**is second ***domain* of *inverse* | |

Predicate | **is first ***domain* of *singleValued* | |

Relation | **is first ***domain* of *domain* | |

**is first ***domain* of *domainSubclass* | |

**is first ***domain* of *holds* | |

**is first ***domain* of *subrelation* | |

**is first ***domain* of *valence* | |

**is second ***domain* of *subrelation* | |

Class | **is third ***domain* of *domain* | |

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

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