Winstonm, on May 8 2010, 11:44 AM, said:
http://www.phy.duke.edu/~rgb/Philosophy/ax...oms/node27.html
Quote
For a long time - that would be thousands of years - after the invention of axiomatic reasoning, this was the way the world worked. Philosophers (and a whole lot of mathematicians) continued to think of axioms as self-evident truths, laws of logic and mathematics, as it were, and a hundred-odd generations of students derived Euclid's theorems about triangle congruence without ever thinking too deeply about them. Even the belated discovery that there could be different axioms that led to different theorems left the sanctity of axiomatic and logical reasoning itself untouched, seducing many a philosopher to continue using the essentially classical reasoning processes that follow, in fact, from using a number of self-evident axioms that were rarely to never openly acknowledged and which were all unprovable assumptions, every one
.
It's unfortunate that the last thread was deleted; I posted a reply.
Anyway, I think you're conflating two separate things - truth and knowledge. You seem to keep returning to this notion of using an unproven truth as an axiom or as a premise in an argument to further prove something else. I'm not saying that an unproven truth is USEFUL; clearly, an argument is only as good as its weakest premise.
You said in your last post (or almost your last post) in the previous thread that truth is the result of empirical investigation. This is inaccurate; the truth PRECEDES empirical investigation. The result of investigation is not truth; it's knowledge. The truth is already there.
Imagine a world identical to our own, but in which everyone were 100% color-blind. Monochrome. (For the sake of this discussion, you're going to have to assume that somehow, they all knew what color was despite being color blind. Maybe they all went color-blind simultaneously, before anyone on the planet saw a canary or a bluebird).
On the Monochrome Bridge Forums one day, one person says that canaries and bluebirds are the same color. One person says they're not. There's no evidence in either case; the species were discovered after color-blindness took effect. They just each have these unsupported beliefs. The person who said they're not the same color has made a true statement. The truth of the state of affairs has nothing to do with investigation; they're different colors. Light reflects off of them at different wavelengths, whether it can be perceived, proven, or otherwise demonstrated to anyone. They don't have
knowledge, because they don't have verifiability. Any argument that starts with "Canaries and bluebirds are different colors" (or it's negation) is only as strong as an wholly unsupported (and unsupportable) assertion - not very strong at all (or, as the logical positivists might say, "meaningless," or at least irrational). Nevertheless, the statement is still
true.
As PassedOut points out, that doesn't get you any closer to establishing which of the statements is true, and as you point out, it's logically pointless, since they can't know which statement true. But that doesn't mean it's not true. Some truths are unknown (unknowable, even).
The earth didn't start revolving around the sun when it was proven - the truth preceded the science. Physics didn't make it true - physics made it
knowledge - demonstrable, verifiable truth that can usefully used as a premise in a subsequent argument.
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