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Can it be tested for validity and soundness? Yep. It's an argument. Arguments don't have to be valid to be an argument... Didn't we already do this? It's like you think things have to be useful to fit. They don't. If we test an argument for validity and find that it isn't valid, it doesn't cease to be an argument. Someone still attempted to give reasons for a conclusion. That's all an argument is.Well, you've demonstrated that there are still plenty of dumb people on the internet, as long as you have enough time to fish them out to support bizarre claims.Of course no one manages to give real examples of such a thing, but source #3's attempt is particularly fun:
Premise: No items on this menu are chicken dishes.
Conclusion: Therefore, no chicken dishes are items on this menu.
These are some quality sources you've dug up, Orel!
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All I claimed was that one premise and one conclusion is all that's necessary for an argument. Never said it was "valid" or "proper".If you know anything about validity you will know that it is a formal property. This means that it can be assessed without knowing the specific content of an argument. "P, therefore, Q," is not a valid form. Descartes' claim can only be considered a valid argument if we go back to his text and recognize the presupposition of P1. If you truly believe that Descartes is not including P1, then his claim is invalid and unsound, and does not even rise to the level of a proper argument.
You didn't even acknowledge the necessity of the premise D(x)->O(x) until #424. In #418 you said it was true, but said the argument was valid without it. In #420 and #422 you were simply excusing the existence of exceptions.Heck, in #418, #420, and #422 I was already arguing for P3, but you kept drawing us off onto tangents about the strange formalizations you wanted to present, ignoring the substance that was being presented to you. I am the one who preferred Tinker's informal approach. You are the one who felt the need to formalize everything. In informal speech we often omit premises. Again, I think that is the better approach, but if you want to get all formal then you'll have to play by the rules.
So yeah, how do you prove D(x) -> O(x) ?
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