Combining Texts

Ideas for 'fragments/reports', 'Posterior Analytics' and 'Grundlagen (Foundations of Theory of Manifolds)'

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2 ideas

26. Natural Theory / A. Speculations on Nature / 5. Infinite in Nature

1748	Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius]
	Full Idea: Archelaus was the first person to say that the universe is boundless.
	From: report of Archelaus (fragments/reports [c.450 BCE]) by Diogenes Laertius - Lives of Eminent Philosophers 02.Ar.3

26. Natural Theory / B. Natural Kinds / 6. Necessity of Kinds

12375	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).