I return to a question I was discussing back in August with John the Commenter and more recently with Lukas Novak. The question concerns how to define 'primary substance.' I suggested the following: ". . . an individual or singular complete concrete entity together with its accidents. " But why include the accidents? I gave the following argument:
1. Every primary substance is ontologically basic, where ontologically basic entities are those that exist
per se or independently unlike secondary substances and accidents.
2. Every ontologically basic entity is complete.
Definition: x is complete =df for every predicate F, either x is F or x is not F. (This is rough since some restrictions will have to be placed on the range of the predicate F. But it is good enough for a blog post.) Thus either Socrates is seated at t or he is not. If he is neither seated nor not seated at t, then he is an incomplete object at t. But if he is an incomplete object at t, then he cannot exist at t. Now every ontologically basic entity is possibly such that it exists. Therefore, every ontologically basic entity is complete. Every ontologically basic entity satisfies the predicate version of the Law of Excluded Middle. (I don't think the converse is true, but then I am not affirming the converse.)
Therefore
3. Every primary substance is complete. (from 1, 2)
4. No primary substance minus its accidents is complete.
5. No primary substance minus its accidents is a primary substance. (from 3, 4)
Lukas Novak responds:
. . . although I concede that necessarily, Socrates has this or that accident, I deny that it follows from it that Socrates considered in abstraction from these accidents is an incomplete object. When Socrates runs, the whole of Socrates is there. When Socrates does not run, again, the whole of Socrates is there. But for any x, y, if the whole of x is there even if y is not there then y is not required for the completeness of x. So Socrates considered precisely qua Socrates, without running or not-running, is complete, and a substance – – the fact that a necessary condition of his existence is that he is connected either with the accident of running or the accident of not-running notwithstanding.
I suspect that Novak has committed an ignoratio elenchi against me. I grant that when Socrates runs, the whole of Socrates is present, and that when he is not running, the whole of him is present. (For when he is not running, he is walking, or skipping, or jumping, or standing still, or crouching . . . .) And so I grant that it is not necessary for the completeness of Socrates that he be running, and that it is not necessary for the completeness of Socrates that he be not running. But — and here is my point — it is necessary for the completeness of Socrates that either he be running or not-running. If he is neither, then he is incomplete, hence not a primary substance. The same holds for all contingent accidents.
Therefore, a primary substance minus its accident is not a primary substance.
My argument above is valid. If Novak thinks it unsound, he must tell me which premise he rejects.
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