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10. Modality / A. Necessity / 10. Impossibility

[negative necessity - what never could be the case]

7 ideas
From the necessity of the past we can infer the impossibility of what never happens [Diod.Cronus, by White,MJ]
Things are impossible if they imply contradiction, or their production lacks an external cause [Spinoza]
A thing is shown to be impossible if a contradiction is demonstrated within its definition [Berkeley]
Nothing we clearly imagine is absolutely impossible [Hume]
Necessity implies possibility, but in experience it matters which comes first [Williams,B]
How can we know the metaphysical impossibilities; the a posteriori only concerns this world [Chalmers]
Possibilities are manifestations of some power, and impossibilies rest on no powers [Jacobs]