*Candela* | *documentation* SI LuminosityIntensityMeasure. Symbol: cd. It is one of the base units in SI, *and* it is currently defined as follows: the *Candela* is the luminous intensity, in a given *direction*, of a source that emits *monochromatic* radiation of *frequency* 540*10^12 *Hertz* *and* that has a radiant intensity in that *direction* of 1/683 *Watt* per *Steradian* | |

**is an ***instance* of LuminosityIntensityMeasure | |

**is an ***instance* of SystemeInternationalUnit | |

UnitOfMeasure | **has axiom** (=> (*and* (*equal* (*MeasureFn* ?NUMBER ?UNIT) ?QUANT) (*subclass* ?UNIT ?QUANTTYPE) (*not* (*equal* ?QUANTTYPE UnitOfMeasure))) (*subclass* ?QUANT ?QUANTTYPE))
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**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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**is second ***domain* of *MeasureFn* | |

Function | **is first ***domain* of *AssignmentFn* | |

**is first ***domain* of *closedOn* | |

**is first ***domain* of *range* | |

**is first ***domain* of *rangeSubclass* | |

PhysicalQuantity | **is partitioned into** ConstantQuantity, FunctionQuantity | |

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

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

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