Talk:Q36906466
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Autodescription — universe (Q36906466)
description: class of which Our Universe is an instance, and parallel universes, if any, are also instances
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- Report on constraint conformation of “universe” claims and statements. Constraints report for items data
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- Subclasses (classes which contain special kinds of items of this class)
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universe⟩ on wikidata tree visualisation (external tool)(depth=1) - Generic queries for classes
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{{Item documentation}}.
Description[edit]
What is universe (Q36906466)? --Fractaler (talk) 06:41, 17 August 2017 (UTC)
- @Fractaler: Q36906466 is a class. Multiverses (Q3327819) contain universes (Q36906466) such as the Universe (Q1). See the second sense of wikt:universe#English. --Yair rand (talk) 00:42, 18 August 2017 (UTC)
- wikt said: universe (2) - entity similar to our universe; one component of a larger entity known as the multiverse. So, the set Q36906466 is a subset of part (Q15989253)? --Fractaler (talk) 06:32, 18 August 2017 (UTC)
Superset[edit]
physical system (Q1454986)? Description said: universe (Q36906466) - "class of which Our Universe is an instance, and parallel universes, if any, are also instances". But parallel universe (Q2051667) is not physical system (Q1454986), it is hypothetical entity (Q18706315). --Fractaler (talk) 17:35, 20 August 2017 (UTC)
- @Fractaler: This is a very good point, and a general issue with hypothetical entities. For parallel universe (Q2051667), if any exist, they are physical system (Q1454986), but because they're hypothetical, their existence and status is in doubt, so they can't be stated/implied to be subclass of (P279) physical system (Q1454986). I'm not sure what the solution to this should be. --Yair rand (talk) 02:30, 21 August 2017 (UTC)
- Each object (Q488383) exists in its own space/universe/world/space of existence of the object/etc (Q29956845). What space (criterion - the destruction of space leads to the disappearance of its objects) we have for: 1) parallel universe (Q2051667), 2)physical system (Q1454986)? --Fractaler (talk) 06:26, 21 August 2017 (UTC)
- @Fractaler: @Yair rand: If we go down this path, then no hypothetical concept can have or be an instance, subclass, superclass, etc., of any other item (except an item that is explicitly hypothetical itself). This would lead to a separate class hierarchy for hypothetical objects whose relationship to real objects is unclear, and large changes would have to be made as soon as someone decides that the hypothesis is true. In the case of a class, I believe a hypothetical class may just mean that it may or may not have any concrete instances that exist in our physical world. Its relationships with other classes may still be true regardless of whether it turns out to have any physical instances or not. For example class1 subclass-of class2 means that if an item is an instance of class 1 then it must also be an instance of class2. This may be true even if it turns out that no concrete instances of class1 are found to exist in the real world. DavRosen (talk) 17:25, 23 August 2017 (UTC)
- Have you any description of "hypothetical concept" --Fractaler (talk) 07:54, 24 August 2017 (UTC)