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  FunctionQuantity

Sigma KEE - FunctionQuantity
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函数量
FunctionQuantity 是一个由 Function 它把 ConstantQuantity 的一个或以上的实例和其它 ConstantQuantity 的实例 联系在一起,例如:粒子的速度是用 FunctionQuantity, 把时间的值(ConstantQuantity的实例)和距离 的值(也是 ConstantQuantity的实例)连在一起来表示。注:和 FunctionQuantity 对应的 Function 范围内所有的元素和那个 FunctionQuantity 本身的物理尺寸是相同的。
Relationships      
Parents 物理量 A PhysicalQuantity is a measure of some quantifiable aspect of the modeled world, such as 'the earth's diameter' (a constant length) and 'the stress in a loaded deformable solid' (a measure of stress, which is a function of three spatial coordinates). Every PhysicalQuantity is either a ConstantQuantity or FunctionQuantity. Instances of ConstantQuantity are dependent on a UnitOfMeasure, while instances of FunctionQuantity are Functions that map instances of ConstantQuantity to other instances of ConstantQuantity (e.g., a TimeDependentQuantity is a FunctionQuantity). Although the name and definition of PhysicalQuantity is borrowed from physics, a PhysicalQuantity need not be material. Aside from the dimensions of length, time, velocity, etc., nonphysical dimensions such as currency are also possible. Accordingly, amounts of money would be instances of PhysicalQuantity. A PhysicalQuantity is distinguished from a pure Number by the fact that the former is associated with a dimension of measurement.
Children 面积测量Measures of the amount of space in two dimensions.
 CompositeUnitOfMeasureInstances of this Class are UnitsOfMeasure defined by the functional composition of other units, each of which might be a CompositeUnitOfMeasure or a NonCompositeUnitOfMeasure.
 一元常数函数量A subclass of FunctionQuantity, instances of which are returned by UnaryFunctions that map from one instance of the Class ConstantQuantity to another instance of the Class ConstantQuantity.
 体积测量Measures of the amount of space in three dimensions.


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