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Aristotle on Metaphysics(2004) - Bibotu.com

Aristotle on Metaphysics(2004) - Bibotu.com

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156 THE DEFENCE OF PNCFor example, suppose that we today think that light manifests at <strong>on</strong>ce thebehaviour of waves and the behaviour of particles. And suppose that wethink that light has an essence, i.e. there is something that it is to be thisvery thing—light. Perhaps we think that this essence is what the science,physics, is searching for. It may then appear that we have a truec<strong>on</strong>tradicti<strong>on</strong>: <strong>on</strong>e and the same emissi<strong>on</strong> of light is at <strong>on</strong>ce an emissi<strong>on</strong> ofwaves and an emissi<strong>on</strong> of particles. To show that this is not really a truec<strong>on</strong>tradicti<strong>on</strong>, we will need to c<strong>on</strong>sider what the essence of light is; and bydoing so we will need to show either:(1) what the respect is in which light is the emissi<strong>on</strong> of waves and what thedifferent respect is in which light is the emissi<strong>on</strong> of particles; or:(2) it is not this very thing, light, that is both the emissi<strong>on</strong> of waves andthe emissi<strong>on</strong> of particles, rather, for example, the presence of lightwithin a particular c<strong>on</strong>fines of space implies that there is within thesec<strong>on</strong>fines of space both wave-activity and particle-activity—whichevidently is not even the whiff of a c<strong>on</strong>tradicti<strong>on</strong>.

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