Ideas from 'Abstract Objects' by Gideon Rosen [2001], by Theme Structure
[found in 'Stanford Online Encyclopaedia of Philosophy' (ed/tr Stanford University) [plato.stanford.edu ,-]].
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9. Objects / A. Existence of Objects / 2. Abstract Objects / d. Problems with abstracta
8915
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How we refer to abstractions is much less clear than how we refer to other things
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18. Thought / E. Abstraction / 2. Abstracta by Selection
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The Way of Abstraction used to say an abstraction is an idea that was formed by abstracting
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18. Thought / E. Abstraction / 5. Abstracta by Negation
8912
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Nowadays abstractions are defined as non-spatial, causally inert things
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8913
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Chess may be abstract, but it has existed in specific space and time
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8914
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Sets are said to be abstract and non-spatial, but a set of books can be on a shelf
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18. Thought / E. Abstraction / 6. Abstracta by Conflation
8916
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Conflating abstractions with either sets or universals is a big claim, needing a big defence
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18. Thought / E. Abstraction / 7. Abstracta by Equivalence
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Functional terms can pick out abstractions by asserting an equivalence relation
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8919
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Abstraction by equivalence relationships might prove that a train is an abstract entity
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