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Relationships
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| Instances | Abstract | Properties or qualities as distinguished from any particular embodiment of the properties/qualities in a physical medium. Instances of Abstract can be said to exist in the same sense as mathematical objects such as sets and relations, but they cannot exist at a particular place and time without some physical encoding or embodiment. |
| | Entity | La clase universal de individuos. Es el nodo principal de la ontología. |
| | NonnegativeRealNumber | A RealNumber that is greater than or equal to zero. |
| | Number | A measure of how many things there are, or how much there is, of a certain kind. Numbers are subclassed into RealNumber, ComplexNumber, and ImaginaryNumber. |
| | PositiveRealNumber | A RealNumber that is greater than zero. |
| | Quantity | Any specification of how many or how much of something there is. Accordingly, there are two subclasses of Quantity: Number (how many) and PhysicalQuantity (how much). |
| | RealNumber | Any Number that can be expressed as a (possibly infinite) decimal, i.e. any Number that has a position on the number line. |
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