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Ideas for 'Metaphysics', 'Lectures 1930-32 (student notes)' and 'Sociobiology'

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3 ideas

10. Modality / C. Sources of Modality / 3. Necessity by Convention

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For each necessity in the world there is an arbitrary rule of language [Wittgenstein]

10. Modality / C. Sources of Modality / 6. Necessity from Essence

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Some things have external causes of their necessity; others (the simple) generate necessities [Aristotle]

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Aristotle's says necessary truths are distinct and derive from essential truths [Aristotle, by Koslicki]