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18. Thought / D. Concepts / 3. Structure of Concepts / h. Conceptual priority

[how concepts depend upon one another]

4 ideas
It is unclear whether acute angles are prior to right angles, or fingers to men [Aristotle]
An argument for conceptual priority is greater simplicity in explanation [Dummett]
Maybe a concept is 'prior' to another if it can be defined without the second concept [Dummett]
Conceptual priority is barely intelligible [Oliver]