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Entity > Abstract > Class > Relation > BinaryRelation > UnaryFunction > UnaryConstantFunctionQuantity > TimeDependentQuantity > FrequencyMeasure > Hertz
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Hertz comparison table
Subject be first domain of be second domain of documentation have axiom be third domain of is a kind of is an instance of
FrequencyMeasurerangeSubclassinverseA UnaryConstantFunction of continuous time. All instances of this Class map a time quantity into another ConstantQuantity such as temperature. For example, 'the temperature at the top of the Empire State Building' is a TimeDependentQuantity since its value depends on the time
(=>
(instance ?FUNCTION TimeDependentQuantity)
(domain ?FUNCTION 1 TimeMeasure))
domainSubclassTimeDependentQuantity 
SystemeInternationalUnitSubtractionFnMeasureFnThe Class of Systeme International (SI) units
(=>
(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)))))
 UnitOfMeasure 
HertzSubtractionFnMeasureFnSI FrequencyMeasure. Symbol: Hz. It is the number of cycles per second. Hertz = s^(-1)
(equal
(MeasureFn ?NUMBER KiloHertz)
(MeasureFn (MultiplicationFn ?NUMBER 1000) Hertz))
domainSubclass SystemeInternationalUnit

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