Combining Texts
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'fragments/reports', 'Frege philosophy of mathematics' and 'Letters to Descartes'
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2 ideas
2. Reason / B. Laws of Thought / 2. Sufficient Reason
5969
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Chrysippus said the uncaused is non-existent [Chrysippus, by Plutarch]
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2. Reason / D. Definition / 7. Contextual Definition
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A contextual definition permits the elimination of the expression by a substitution [Dummett]
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