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'Frege philosophy of mathematics', 'Explanation and Reference' and 'The Laws of Thought'
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8 ideas
9. Objects / A. Existence of Objects / 2. Abstract Objects / a. Nature of abstracta
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9885
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The existence of abstract objects is a pseudo-problem [Dummett]
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9. Objects / A. Existence of Objects / 2. Abstract Objects / c. Modern abstracta
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9858
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Abstract objects nowadays are those which are objective but not actual [Dummett]
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9859
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It is absurd to deny the Equator, on the grounds that it lacks causal powers [Dummett]
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9860
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'We've crossed the Equator' has truth-conditions, so accept the Equator - and it's an object [Dummett]
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9. Objects / A. Existence of Objects / 2. Abstract Objects / d. Problems with abstracta
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9872
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Abstract objects need the context principle, since they can't be encountered directly [Dummett]
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9. Objects / D. Essence of Objects / 5. Essence as Kind
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11908
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Putnam bases essences on 'same kind', but same kinds may not share properties [Mackie,P on Putnam]
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9. Objects / F. Identity among Objects / 2. Defining Identity
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9848
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Content is replaceable if identical, so replaceability can't define identity [Dummett, by Dummett]
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9842
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Frege introduced criteria for identity, but thought defining identity was circular [Dummett]
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