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Ideas for 'Conceptions of Truth', 'Darwinian Metaphysics: Species and Essentialism' and 'Mental Acts: their content and their objects'

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15. Nature of Minds / C. Capacities of Minds / 3. Abstraction by mind

8775	A big flea is a small animal, so 'big' and 'small' cannot be acquired by abstraction [Geach]

8776	We cannot learn relations by abstraction, because their converse must be learned too [Geach]