jar2574 said:
And that is why you are not logically correct. A scientific law is not a logical certainty.
Scientific laws change as our experiences and observations change. Logical certainties never change.
You should not treat scientific laws as logical certainties. If you do so, then you are behaving illogically. But should you choose to behave illogically then so be it.
We have an understanding of the world that is based on the principle of cause and effect. We have reached this principle through logical reasoning. We understand that the world may be made of cream cheese mixed with treacle and just appear not to be, but we have only one option, and that is to assume that this fundamental law holds true. This fundamental law is not a law like quantum physics, which is built on top of science. It is a fundamental law on which our understanding of the world, and all of science, is based.
This is as close to a logical certainty as we can get when discussing the world. If we are not allowing these fundamental assumptions then any thought experiment at all is not allowed, because every thought experiment is thought to take place in the physical world, and therefore is subject to these underlying assumptions.
You cannot use this argument to destroy just my thought experiment.
jar2574 said:
And you may use scientific laws as the basis for scientific experiments. But you were not proposing a scientific experiment. You were proposing a thought experiment with a logical conclusion. The conclusion you proposed may follow from scientific laws (though it has not been tested an proven scientifically). But it is not a logical certainty.
It is as much a certainty as anything in this world is. If I cannot assume that what we take to be physical laws hold, then the sun might not rise tomorrow. However, there is no asteroid coming to knock the earth of course, the sun isn't about to disappear (we think), so we're all fairly certain the sun will rise. If you disagree, your doubt of scientific laws must lead you to the only certainty we can reach by logic alone: you think, and so you exist. This is all you can know.
jar2574 said:
Your logic here sounds like the logic used by some to convince others that souls exist. I am shocked that you offered the statement. Just change a few words and notice what you sound like:
The principle that souls exist is accepted by a large majority; hence my example of a person on the street.
If your argument is that I cannot prove this principle, that's fair enough. I can't.
But since most people's understanding of the world is based upon the existence of souls, it's up to you to replace it with something else that explains how the world works.
People's understanding of the world is not based on the existence of souls. They may believe in souls, but they do not base their understanding of the world on them. Mostly, anyway. And not if they're logical. My point was that for everyone who bases their understanding of the world on physical laws my argument will hold. Anyone who does not accept these fundamental concepts has greater problems than whether we can ever make AI.
jar2574 said:
You did not simply assume how the world works. You proposed a hypothesis about how the world WILL work. Your hypothesis has not been proven correct by scientific experiment. And it does not logically follow from your thought experiment.
I believe that everyone shares my assumptions about cause and effect. This is how the world works. If the world works in this way then my hypothesis is true, without the need for proof by actually doing the experiment.
jar2574 said:
You misunderstand Descartes. His statement that "I think, therefore I am," is only the beginning. He attempts to show other things based logically on that.
Yes, he tries to go further, but his reasoning is flawed. All that he showed was that he knows he exists. I gave him credit for inventing 'universal doubt' and getting as far as 'cogito ergo sum' (or cogito ego sum, as I've seen it written. An insight suddenly becomes a boring statement). I could have phrased it better.
jar2574 said:
If you think that a scientific law is a logical certainty then it is solely your personal opinion. And it is incorrect.
There is a difference between scientific laws of the type that are being proposed today, based on experiments, and the fundamental laws by which we allow ourselves to reach conclusions from our experiments. The fundamental laws are, as far as most people are concerned, certainties.
jar2574 said:
I never said what I thought the result of an actual experiment involving two brains would be. I may very well agree with your hypothesis that they would act the same. But I am not going to make the mistake of claiming that they MUST act the same, either due to logical certainty or scientific law. We may be 99.99% sure that they would act the same. But we are not 100% certain.
We're not certain, but within our view of the world, we can be certain that this is the only way things could be.
jar2574 said:
Your justification is interesting. But as you point out, it's just based on personal experience / preference. It's based on your personal beliefs. And your personal beliefs are irrelevant in a thought experiment, or a scientific experiment.
Scientific laws change based on experiences. The earth is not the center of the solar system. Bacteria do not spontaneously generate. You said, "[scientific laws] have more evidence than any other option and are therefore the best option." And that's true if you're conducting a scientific experiment. But we aren't doing that here. We're engaged in a thought exercise.
But we're not dealing with laws based on observations within our world-view. We're dealing with a law about our world-view. If you doubt this law, it's not just a question of saying 'the rest of the world is fine, but I don't think this idea is a good one', as you might regarding bacteria. It's saying 'The whole world is not as it appears. We need to change everything we know to accommodate my idea'. This is because, as I said (in passing) before, this law is a fundamental on which everything else is based, rather than a conclusion from everything else.
jar2574 said:
Logical certainties never change, they are always true. If you want to continue an attempt to combine the two then so be it. But such an attempt is illogical.
Cause and effect is central to the world. To deny that it is a certainty is metaphysics, not science or logic. Metaphysics is a branch of thought where the only arguments can be about consistency, because it is all based on belief. In my view of the world it is a certainty. In anyone else's view of the world it is a certainty: hence my example of asking people whether the car steered left will turn left. Those people watching the car might include people who believe in souls. Their belief in souls is not a fundamental principle of how the world works.
I brought up other people because I saw that this was turning into metaphysics, and I wanted to make the point that it certainly looks like almost all the world agrees with me, and so my point is a reasonable one to bring up, because it will be relevant to a lot of people.
jar2574 said:
I had assumed that the person I was debating was logical. The idea that scientific laws = logical certainty is absurd and illogical.
Indeed. Since making the claim that cause and effect is a scientific law I have pointed out what makes it a certainty but not other scientific laws. As I said previously in this post, it is because cause and effect is a fundamental basis for science, rather than a conclusion from it. We assume it's a certainty in everyday life. It's an assumption that we cannot live without, and that makes it as close to certain as anything in this world can be.
My father, senile and demented though he is, likes to say 'If you don't believe in scientific laws, go throw yourself off a tower. If you don't believe in gravity, there's no danger.'