Quote:
Originally Posted by coosjoaquin
Well get this:
-Logic cannot be defended. Trying to use logic to defend logic is the same as saying the bible is true because the bible says it's true.
-The scientific method is based on three assumptions:
1. There is a single objective reality.
2. Laws of inference apply.
3. Evidence, mixed together with reasoning allows us to discern the truth.
Of course we have no problems making these assumptions because they give us results and frankly you would have to be an idiot who and really likely to win a Darwin award not to.
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Interesting ideas. I'm not sure where you got that from or whether they are your own ideas. However let's consider them.
Logic is rather like mathematics. It does not need to use itself to defend itself. That two and two do not make five is obvious and doesn't need self - justification. Similarly to say that a brick is hard, but if you call it a sponge it becomes soft is obviously wrong. Why, aren't sponges soft? Yes, but it actually has to BE a sponge to be soft and the mistake is a logical fallacy. That is self evident and does not need logic to justify it.
Thus, logical steps, rules and methods are shown to be valid by testing.
"Suppose you tried to play a game in which the rules were arbitrary: each individual could set their own and could change them anytime. I doubt that you would want to play this game for very long. Most of us would rather play games that have a fixed set of rules that do not change during play. Logic is fundamentally a set of rules that we agree to use in our discussions. It is more than that, but that aspect of it will be of great help in our discussions and our thinking.
A simple explanation of logic -- suitable for the level we need here -- is given in Compton's Interactive Encyclopedia:...
Here is another definition of logic extracted from a text book (The Art and Science of Logic by Daniel Bonevac, Mayfield Publishing Co., 1990):
Logic is the study of correct reasoning. Aristotle (384-322 B.C.) founded the discipline of logic as a system of principles on which all other knowledge rests. Indeed, logic pertains to all subjects, since people can reason about anything they can think about. Politics, the arts, literature, business, the sciences, and everyday problems are all subjects open to reasoning. Sometimes the reasoning is good; sometimes not so good. People use logic to tell the difference."
Using Logic
Similarly the scientific method is a kind of logic.
"What is the scientific method''?
The scientific method is the best way yet discovered for winnowing the truth from lies and delusion. The simple version looks something like this:"
1. Observe some aspect of the universe.
2. Invent a tentative description, called a
hypothesis, that is consistent with what you have observed.
3. Use the hypothesis to make predictions.
4. Test those predictions by experiments or further observations and modify the hypothesis in the light of your results.
5. Repeat steps 3 and 4 until there are no discrepancies between theory and experiment and/or observation
5 is, of course, the point at which the hypothesis becomes a theory - an explanation of something tested and supported by evidence to the stage of becoming pretty much proven.
I don't know that I agree with the assumption that there is a single objective reality. So far as I know, science does not and cannot know that, unless it refers to the single objective reality that we experience. We apply science to that and that's quite enough.
Inference applies. If I may quote the ever-handy Wiki
" Inductive
The process by which a conclusion is inferred from multiple observations is called
inductive reasoning. The conclusion may be
correct or incorrect, or correct, or correct to within a certain degree of accuracy, or correct in certain situations. Conclusions inferred from multiple observations may be tested by additional observations."
Reasoning, like logic is seen to be valid or not on its own terms. Indeed, it is much akin to logic. It makes assumptions, true, but unlike faith, it tests them according to methods designed to avoid self - deception (controls)and the results are tested and re-appraised. They are not adopted as some sort of dogma which no-one is allowed to question. Or, that ought to be the case.
"Evidence, mixed together with reasoning allows us to discern the truth."
I would say that evidence evaluated using reasoning, or the methods for evaluation, based on reasoning, allows us to discover which way the evidence points. That's the only way or method that has been shown to be a reliable way of finding fact - or 'truth' as you say.
"Of course we have no problems making these assumptions because they give us results"
Well, yes, but I think the methods needed a little justification, otherwise it looked too much like making up a set of rules which would give us the results we wanted.
Thanks. I shall keep this on my box, in case some theist demands to know why we should think logic or science have any validity.