Combining Texts

Ideas for 'fragments/reports', 'Fourfold Root of Princ of Sufficient Reason' and 'Against Structural Universals'

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2 ideas

18. Thought / D. Concepts / 2. Origin of Concepts / b. Empirical concepts

21921

Concepts are abstracted from perceptions [Schopenhauer, by Lewis,PB]

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

15443

Mathematicians abstract by equivalence classes, but that doesn't turn a many into one [Lewis]