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Ideas for 'Leibniz', 'The Science of Knowing (Wissenschaftslehre) [1st ed]' and 'Rules for the Direction of the Mind'

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2 ideas

10. Modality / C. Sources of Modality / 4. Necessity from Concepts

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3+4=7 is necessary because we cannot conceive of seven without including three and four [Descartes]

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Necessary truths derive from basic assertion and negation [Fichte, by Pinkard]