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'On the Question of Absolute Undecidability', 'Mental Acts: their content and their objects' and 'Minds, Brains and Science'
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15. Nature of Minds / C. Capacities of Minds / 3. Abstraction by mind
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A big flea is a small animal, so 'big' and 'small' cannot be acquired by abstraction [Geach]
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We cannot learn relations by abstraction, because their converse must be learned too [Geach]
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