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Sigma KEE  LengthMeasure
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length measure
A
subclass
of
ConstantQuantity
, instances of which are measures of length.
Relationships
Parents
constant quantity
A
ConstantQuantity
is a
PhysicalQuantity
that has a constant value, e.g. 3
Meter
s and 5
HourDuration
s. The magnitude (see
MagnitudeFn
) of every
ConstantQuantity
is a
RealNumber
.
ConstantQuantity
is distinguished from
FunctionQuantity
, in that each instance of the latter is formed through the mapping of one
PhysicalQuantity
to another
PhysicalQuantity
. Each instance of
ConstantQuantity
is expressed with the
BinaryFunction
MeasureFn
, which takes a
Number
and a
UnitOfMeasure
as arguments. For example, 3
Meter
s is expressed as (
MeasureFn
3
Meter
). Instances of
ConstantQuantity
form a partial order (see
PartialOrderingRelation
) with the
lessThan
relation, since
lessThan
is a
RelationExtendedToQuantities
and
lessThan
is defined over the
RealNumber
s. The
lessThan
relation is not a total order (see
TotalOrderingRelation
) over the class
ConstantQuantity
since elements of some subclasses of
ConstantQuantity
(such as length quantities) are incomparable to elements of other subclasses of
ConstantQuantity
(such as mass quantities).
Children
altitude measure
The vertical distance of a level, a point or an object considered as a point, measured from mean sea level.
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