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Entity > Abstract > Class > Relation > BinaryRelation > UnaryFunction > MagnitudeFn
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MagnitudeFn comparison table
Subject have domain1 have range documentation have axiom is a kind of is an instance of
UnaryFunction  The Class of Functions that require a single argument
(=>
(instance ?FUNCTION UnaryFunction)
(valence ?FUNCTION 1))
Function 
MagnitudeFnConstantQuantityRealNumberThe magnitude of a ConstantQuantity is the numeric value for the quantity. In other words, MagnitudeFn converts a ConstantQuantity with an associated UnitOfMeasure into an ordinary RealNumber. For example, the magnitude of the ConstantQuantity 2 Kilometers is the RealNumber 2. Note that the magnitude of a quantity in a given unit times that unit is equal to the original quantity
(equal (MagnitudeFn (MeasureFn ?NUMBER ?UNIT)) ?NUMBER)
 UnaryFunction

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