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Ideas for 'Being and Time', 'Posterior Analytics' and 'Marx'

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26. Natural Theory / B. Natural Kinds / 6. Necessity of Kinds
Whatever holds of a kind intrinsically holds of it necessarily [Aristotle]
     Full Idea: In each kind, whatever holds of something in itself and as such holds of it from necessity.
     From: Aristotle (Posterior Analytics [c.327 BCE], 75a30)
     A reaction: This seems to confirm the view that essential properties are necessary, but it does not, of course, follow that all necessary properties are essential properties (e.g. trivial necessities are not essential).