[quote]Sylvius the Mad wrote...
No you don't. You can merely suppose that one is true, rather than assuming it. Rhetoric does this all the time. Rather than assume something to be true in order to follow reasoning arising from it, we can suppose it is true as a rhetorical device to investigate the consequences of it actually being true, regardless of whether you know it to be true. [/quote]
A) You can't explore the consequences of it being true. It's simply impossible for you to model reality in this way, unless you're going to argue that you can simultaneously perceive all possible outcomes an (effective) infinite number of years into the future.

Even if you could actually see the almost infinite permutations that would branch out from a single dedicision and evaluate this in enough time to actually decide, you would still make that decision with reference to external characteristics.
Put another way, it doesn't matter what you suppose is true. What you have to do is have a viable framework to choose some outcome.
C) There's no form of reasoning available to you to do what you want to do. Logic simply cannot operate to do this - it has inherent limits that make this kind of prediction impossible.
[quote]When you have to make some choice (which is not always the case), those "empty" conditionals make it very clear which sets of choices are nonsensical and should be avoided. [/quote]
You always have to make a choice. There's no situation where you don't have at least two possible courses of action.
And even if you're right - even if you can eliminate some (almost) infinite number of sets) that are 'nonsensical' - you still have a large number of generally 'sensical' options that you still haven't collapsed.
Put another way, even if you can reject the absurd, you haven't eliminated all possible options but one.
[quote]Who cares how people use the words? If people take truth to be anything other than a binary condition, those people are wrong. [/quote]
No. People use the word "truth" to apprehend a different concept. Are you willing to argue that words have some Platonic ideal that they apprehend? Because otherwise it doesn't matter what the combination of sounds/set of scripts that forms "truth" apprehends, as long as we all understand it to mean the same thing.
I suppose you'd object to words having multiple meanings, but even if that were true, then we can still reject using "truth" to describe this kind of binary condition and instead capture a more pragmatic form of knowledge, because it's a more relevant meaning.
[quote]But we just don't know what the truth is, most of the time. This is why I encourage people to apply Schrödinger's Cat on a macro level. [/quote]
You mean, the thought experiment designed to show that superimposed states are prima facie absurd and should never be given serious intellectual consideration?
[quote]First of all, the metal contraptions appear to fly through the sky. Don't get ahead of yourself. [/quote]
Well, see - that's my point about choice. On the one hand, you refuse to even posit that reality exists in a meaningful sense. But on the other hand, you act as it if does. What reason can you offer for why you should suppose that any of your sensory inputs are worth relying on?
[quote]Second, the engineer has mountains of empirical data supporting those best guesses. You don't have anything like that same body of empirical observations to support your guesses regarding any individual's behaviour. [/quote]
Actually, we have millions of years of hard-wired biological programming, thousands of years of culture, and decades of socialization. We have so much information that it would be impossible - until very likely quite recently in our lifetimes - to even store the amount of data that we rely on to draw these inferences.
You assume that if you don't have information that you can syntactically manipulate you don't have information, but that's just false. A fundamental part of your functioning
outright defies description by syntactic processing.
[quote]"There is no truth in science." I had a professor in my first year of university who opened the very first lecture with those exact words. Science only tells us what isn't true, not what is. Karl Popper FTW. [/quote]
Popper is wrong. Duhem rejected his entire thesis before he even formulated it.
It's called the problem of underdetermination. I'll give you the simple case (but please challenge it rigorously - it's been years since I've really discussed it and don't have time to re-research, so my recollection might be poor; the same applies to my notation, so please ask me if anything about how I noted it in formal logic).
Popper assumes that we have some theory T that implies some observation O. If we observe Not O, then we can reject theory T on the basis of modus ponens.
So, T => O, ~O, therefore, ~T.
The problem is that the systme is not T => O. The actual theory T can only functionally exist in a system with some untestable assumptions (UA), and a lot of auxiliary assumptions (AA) from other theories which either share similar UAs or have their own underlying AAs. So the actual structure is more akin to:
(AA ^ AA' ^ AA'' ^ AA''' ^ AA'''' ^AA'''''' ^ AA''''''' ^ UA ^ UA' ^ UA'' ^ UA''' ^ UA"'' ^ T) => O, and if we have ~O, then we have ~ (AA ^ AA' ^ AA'' ^ AA''' ^ AA'''' ^AA'''''' ^ AA''''''' ^ UA ^ UA' ^ UA'' ^ UA''' ^ UA"'' ^ T) rather than ~T.
[quote]Do you think it's possible to know that something is false? [/quote]
No, because it's impossible to know whether logic is actually a justified system of inference, so presuming that logical opposites actually denote true impossibility is unjustified.
If logic tells me that a particular state is logically impossible, that doesn't mean that logic is justified.
I suppose you could say that even in that case I know some element of the set is false, but if I can't know which element of the set is false, the it's meaningless.
[quote]I spot contradictions. It comes naturally to me. No matter how far removed in time or space, I notice contradictions. If someone says something to me now that is incompatible with a set of things he said to me earlier, I'll notice. I'll know he's lying to me, or that he's mistaken, or that he misspoke on at least one occasion. But I'll know the set of statements this person has made is, taken together, false. [/quote]
See above. There's no reason to suppose that logic can demonstrate falsity.
[quote]I don't believe you.
...
Nor do I disbelieve you. [/quote]
Clever. I am still going to reiterate being sorry.
[quote]They identify falsehood, so that I can avoid it.[/quote]
Again, you can't demonstrate that your own system of infernece isn't itself false, even if you've used it correctly.
[quote]Of course it's irrelevant. We can't ever have it. Truth is beyond us.
But we can distinguish between things that are possibly true and necessarily false. Conclusions that are necessarily false are conclusions we should never draw, but your system of reasoning will occasionally draw them . [/quote]
We can't. Because we have no reason to suppose that "necessarily false" has any value or meaning other than being a particular product of some formal system that we have no basis to believe corresponds to anything.
[quote]Within the set of possibly true conclusions, yes, what you describe is eaxctly what we should do. But that's not the first step. First we need to find the set of possibilty true conclusions and stay within it. If we don't do that first, then our reasoning will not be falsifiable. [/quote]
Our reasoning can never be falsifiable. That's the problem.
[quote]With regard to action, yes. No one disputes this. [/quote]
With regard to anything, even choosing a system of evide
[quote]Games aren't reality.[/quote]
Games operate by the same inferential rules.