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Old 05-05-2008, 09:01 PM   #101 (permalink)
pseudonous
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Remster


Since 1/xy > 1/xyz, it follows that the arguement based on less assumptions is more likely to be true.
do you mean that if each axiom had a equal probability of being correct
that the probabilitys of just 2 axioms being correct to make the conculsion correct is greater then having three axioms?
No, each axiom was assigned its own unknown probability of being correct as follows:
The probability the axioms are true is unknown. The probability of axiom A is 1/x, the probablity of axiom B is 1/y and the probability of axiom C is 1/z.

The probability that two of the three axioms are true is greater than the probability that all three axioms are true.

As Romansh pointed out there may be other unknown axioms which could make the conclusions true even if axioms A, B and C are false. This additional complexity can be taken into account, if the conclusion of the argument based on two of the three axioms is included in the conclusion of the arguement based on all three axioms. On the other hand, if the conclusions of each argument are significantly different there is no way I know of to determine which is more likely.
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Old 05-06-2008, 07:11 AM   #102 (permalink)
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Sorry, about getting off track. Give me a bit of time to think about these two hypothetical theories and I'll see what I can come up with. It seems to me there might be a metaphysical aspect to theory 2.
No problem – take your time. And sorry for not making my intentions clearer.

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Old 05-06-2008, 06:29 PM   #103 (permalink)
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Remster,

I have a question about the wording you used for theory 2.


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Theory 2. Newton's theory combined with the theory that some powerful though otherwise undetectable being makes it seem to us that very large and very small objects behave in anti-Newtonian ways.
When you say a powerful being makes it seem that objects behave in an anti-Newtonian way, what exactly are you trying to say? I'm having a hard time imagining this. If, for instance, the anti-Newtonian theory says that lead can be turned into gold, how would a being make lead only appear to be gold? After all, if the metal was shiny like gold had the density, the conductivity, melting point, etc.. of gold then it would be gold. Or, if the anti-Newtonian theory suggested we could build some dark matter engine to send spaceships to other solar systems how could this merely be an illusion? Wouldn't this being have to, in fact, be causing objects to behave in an anti-Newtonian way rather than just giving the illusion that they behave in an anti-Newtonian way?
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Old 05-06-2008, 07:37 PM   #104 (permalink)
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No, each axiom was assigned its own unknown probability of being correct as follows:
The probability the axioms are true is unknown. The probability of axiom A is 1/x, the probablity of axiom B is 1/y and the probability of axiom C is 1/z.

The probability that two of the three axioms are true is greater than the probability that all three axioms are true.

As Romansh pointed out there may be other unknown axioms which could make the conclusions true even if axioms A, B and C are false. This additional complexity can be taken into account, if the conclusion of the argument based on two of the three axioms is included in the conclusion of the arguement based on all three axioms. On the other hand, if the conclusions of each argument are significantly different there is no way I know of to determine which is more likely.
ok, i think i see now. it doesn't make sense to have decimals in the denominator for probabilitys right?
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Old 05-06-2008, 08:12 PM   #105 (permalink)
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ok, i think i see now. it doesn't make sense to have decimals in the denominator for probabilitys right?
No, the probability would be some number between 0 and 1. So the x in 1/x would have to be 1 or greater.
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Old 05-06-2008, 10:34 PM   #106 (permalink)
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That's a different issue (if an interesting one). What I'm concerned about here is whether you can believe that the symptoms of your tinnitus – ringing in the ears, right? – are there when they're not.
If I listen for the ringing it's there, sometimes it "imposes itself". Is it there otherwise??? Is my hand there when I put my arm behind my back? I can only suppose.

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Are you agreeing with me that the self-evidence to us that x = x is no more evidence that x = x than the self-evidence to some theists that God exists is evidence that God exists?

(Obviously I'm not using 'self-evidence' as a success term here. If you prefer to use it that way, you may replace 'self-evidence' above with 'apparent self-evidence' or 'seeming self-evidence'.)
For x = x, I would treat it as a definition or a bloody good assumption, not necessarily provable ... because I would have to use x = x to prove it. An axiom. For me, x = x is 'more' self evident than god exists is self evident. For example some of the evidence for god existing can have other explanations. Whereas other evidence for x <> x is meaningless?
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Old 05-06-2008, 10:56 PM   #107 (permalink)
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Romansh

I agree largely with what you are saying but I would add that in some situations we do have a way of telling that 1/O(AB) gives us better odds than 1/O(ABC). This is what I was trying to illustrate in my previous post perhaps I need to rethink this. Did you have any specific objection to my previous post or was it just in general unclear? I am thinking it may be that I am not using O(AB) in quite the same way as you.
Nous,

I'm not sure ... a little out of my depth here
But it would seem to me we should be able to say

1/O(AB) > 1/O(ABC)

Because O(ABCDEF..........) should approach 1?
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Old 05-07-2008, 11:43 AM   #108 (permalink)
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Wouldn't this being have to, in fact, be causing objects to behave in an anti-Newtonian way rather than just giving the illusion that they behave in an anti-Newtonian way?
I can't see why. I don't know enough about physics to give a concrete example, but consider whatever observations have led physicists to conclude that Newton was wrong. These observations could all be illusory or otherwise misleading. For example, the being might manipulate our sense organs or the laboratory environment, or he might tamper with our equipment so it produces inaccurate images or readings. Is that hard to imagine?

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Old 05-07-2008, 11:46 AM   #109 (permalink)
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If I listen for the ringing it's there, sometimes it "imposes itself". Is it there otherwise??? Is my hand there when I put my arm behind my back? I can only suppose.
I'm failing to get the point across. The question I'm raising isn't whether sounds, arms, etc. continue to exist when they're not being perceived, i.e. whether they're objective. Rather, the question I'm raising is whether it's possible to have false beliefs about the subjective, i.e. things that exist only while you're experiencing them.

Pain is often taken as the paradigm subjective thing (presumably because it's often vivid and there's no objective analogue with which it might be confused). Hence my original question: 'Do you know whether you're in pain right now?' You replied (in part): 'I gather some amputees can still feel (including pain from) the missing limb'. I should have stopped you there, because the relevant question isn't whether amputees can be mistaken that they're feeling pain from a missing limb, which evidently they can, but whether they can be mistaken that they're in pain. Can you see the distinction?

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For x = x, I would treat it as a definition or a bloody good assumption, not necessarily provable ... because I would have to use x = x to prove it. An axiom. For me, x = x is 'more' self evident than god exists is self evident. For example some of the evidence for god existing can have other explanations. Whereas other evidence for x <> x is meaningless?
First up, the fact that some of the evidence for God's existence can be explained in other ways is kind of irrelevant, since we're talking specifically about the putative self-evidence of God's existence. Can that be explained away in a manner in which the putative self-evidence of 'x=x' can't?

Either way, the main issue here is whether you know that x=x, and the alternative you've given to its being an assumption (which is where I want to end up) is that it's a definition. A definition of what? And is a definition the sort of thing that can be true or false? If so, how do you know whether it's true or false that x=x?

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Old 05-07-2008, 08:56 PM   #110 (permalink)
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Romansh

I agree largely with what you are saying but I would add that in some situations we do have a way of telling that 1/O(AB) gives us better odds than 1/O(ABC). This is what I was trying to illustrate in my previous post perhaps I need to rethink this. Did you have any specific objection to my previous post or was it just in general unclear? I am thinking it may be that I am not using O(AB) in quite the same way as you.
Nous,

I'm not sure ... a little out of my depth here
But it would seem to me we should be able to say

1/O(AB) > 1/O(ABC)

Because O(ABCDEF..........) should approach 1?
Romansh

I see what you are saying now. I totally misunderstood and misused your sysmbolism. I agree that O(ABCDEF..........) should approach 1 and that 1/O(AB) > = 1/O(ABC)

Still, if the simpler conclusion is contained in the more complex conclusion
then we can say that the argument with the simpler conclusion is more likely to be true than the argument with the more complex conclusion.

In this case if we had additional axioms that came into play, they would either lead to both conclusions or just the simpler conclusion.

For instance, say that axiom D (prob. 1/s) and axiom E (prob. 1/t) also implied that the conclusion based on axioms A and B. Then the probability that the conclusion is true would become 1/xy + 1/st.

And if any axioms F (prob. 1/n) and G (prob. 1/m) increased the conclusion based on axioms A, B and C to 1/xyz + 1/nm, it would also increase the probability of the simpler conclusion to 1/xy + 1/st + 1/nm.

So the probability of the simpler argument would always remain higher than the more complex argument no matter how many unknown axioms may come into play.

An rough example of two arguments with this relationship would be;

1. Objects in moving in a straight line continue to do so unless acted on by an external force.
2. The planets orbit around the sun.
3. Therefore a force is exerted on the planets.

1. God is the cause of all things.
2. Objects in moving in a straight line continue to do so unless acted on by an external force.
3. The planets orbit around the sun.
4. Therefore the god causes a force to be exerted on the planets.

I'm sure there is a better example but I am getting lazy.


What do think? Are there any flaws?
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