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Entity > Abstract > Class > Relation > Function > BinaryFunction > DensityFn
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DensityFn comparison table
Subject have domain2 have domain1 partition into be first domain of have range be second domain of documentation have axiom is a kind of is an instance of
BinaryFunction   identityElement distributesThe Class of Functions that require two arguments
(=>
(instance ?FUNCTION BinaryFunction)
(valence ?FUNCTION 2))
TernaryRelation 
DensityMeasure  ConstantQuantity, FunctionQuantityrangeSubclass SubtractionFnA FunctionQuantity is a Function that maps from one or more instances of ConstantQuantity to another instance of ConstantQuantity. For example, the velocity of a particle would be represented by a FunctionQuantity mapping values of time (which are ConstantQuantities) to values of distance (also ConstantQuantities). Note that all instances of FunctionQuantity are Functions with a fixed arity. Note too that all elements of the range of a FunctionQuantity have the same physical dimension as the FunctionQuantity itself
(<=> 
(instance ?ABS Abstract)
(not
(exists (?POINT)
(or
(located ?ABS ?POINT)
(existant ?ABS ?POINT)))))
FunctionQuantity 
DensityFnVolumeMeasureMassMeasureConstantQuantity, FunctionQuantityidentityElementDensityMeasuredistributesA very general FunctionQuantity. DensityFn maps an instance of MassMeasure and an instance of VolumeMeasure to the density represented by this combination of mass and volume. For example, (DensityFn (MeasureFn 3 Kilogram) (MeasureFn 1 Liter)) represents the density of 3 kilograms per liter
(=>
(instance ?FUNCTION BinaryFunction)
(valence ?FUNCTION 2))
 DensityMeasure

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