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	How we refer to abstractions is much less clear than how we refer to other things

18. Thought / E. Abstraction / 2. Abstracta by Selection

8917	The Way of Abstraction used to say an abstraction is an idea that was formed by abstracting

18. Thought / E. Abstraction / 5. Abstracta by Negation

8912	Nowadays abstractions are defined as non-spatial, causally inert things

8913	Chess may be abstract, but it has existed in specific space and time

8914	Sets are said to be abstract and non-spatial, but a set of books can be on a shelf

18. Thought / E. Abstraction / 6. Abstracta by Conflation

8916	Conflating abstractions with either sets or universals is a big claim, needing a big defence

18. Thought / E. Abstraction / 7. Abstracta by Equivalence

8918	Functional terms can pick out abstractions by asserting an equivalence relation

8919	Abstraction by equivalence relationships might prove that a train is an abstract entity