instantc wrote:
Furrowed Brow wrote:
instantc wrote: Do you or do you not agree that if a theory contradicts itself logically, we can rule it out without testing it empirically? .
What logic are we using. Boolean, predicate logic, Hegelian, fuzzy and many valued logic (there are many), modal, intuitionistic (does not except excluded middle or double negation), paraconsistent (non classic that treats contradictory information as informative) etc.
To be honest I'd be inclined to stick with classic two valued logic and say yes.
instanc wrote:Just answer yes or no
But here's the problem. How do we know that we have been thorough and worked through every possibility including concepts we are as yet to think up. Let's say we have a theory that classic logic and our best models says is a inconsistent, and we do a series of experiments that shows this theory is not only very accurate but makes correct predictions other valid theories just can't explain. I suspect we change our logic. Schrödinger invented his famous cat is both dead and alive thought experiment to disprove the Copenhagen interpretation. What happens now? The contradiction is used to illuminate what it is supposed to disprove. Go figure.
Maybe the correct approach is to call out contradictions where we find them, and collect evidence as best we can, and try to explain the data with the least number of contradictions using the most plausible logic. But we may end up with a view of reality and a logic that is a long way from both common sense and any simple logic we might draw with Venn diagrams. When evidence contradicts our ingrained sensibilities I think evidence wins.
I'm not saying it wouldn't be problematic, nor do I want to exaggerate the usefulness of logical analysis. Goat here, whom I was talking to, thinks that even if a theory suggests two mutually exclusive outcomes, we cannot rule out that theory without testing it around in a laboratory. That is an odd position indeed that makes debating very frustrating and difficult.
As I said before, to convince anyone of a claim, you need all 3 (in this order):
1. Logic
2. Argument
3. Evidence
None of these can stand on their own. The only way you can have a Sound Valid Argument is to employ EVIDENCE (observable/testable)
If you differ, then give me one, just one Sound Argument or just one Valid Argument without the use of evidence that can convert a claim into a conclusion (fact).
Just one, and I will admit defeat.
And yes, I agree with Goat.
Have you ever heard of the two slit experiment? Try to explain that without evidence. Can you?