So many threads ask whether this or that is logical. Is probabllity logical? Are moral arguments logical? And so on. I never know what it is being asked by such questions. Is there something clear and specific that is being asked by the question, is X logical? What is it?
Logic is deductively eliminating contadictions, and arriving at a "true" primary, respective to the axiom existence exists. Or as Ayn Rand puts it, "non-contradictory identification." In reality, contradictions cannot exists i.e an apple cannot be an orange at the same time or in the same respect. Saying an apple is an apple and an orange at the same time, is a contradiction in identity.
Ex.) All Dogs chew bones.
Chip is a dog.
Therefore Chip chews bones.
The third statement is logical, providing the validity of the Syllogism's major premise.
The goal of logic is "true" knowledge, based on the facts of reality. It is the tool of reason.
---------- Post added 12-10-2009 at 11:29 PM ----------
I agree with Reconstructo in the term that Logical is more or less an opinion someone has depending on whether or not something is persuasive.
This is nonsense. In no way is logic subjective. Logic is the product of natural laws and facts of reality. To say it is governed by rhetoric is to deny any foundation of knowledge. It is to say that A is B, it is to undercut the law of identity. It is to say that fire is water, if "I" say so. It is to say i can drink crude oil instead of water.
I believe that logical is something that has more facts, or more things proving it than there are things disproving it. However, this does have to do with persuasion.
Logic is absolute, there is no compromise, there is no psuedo-truth. There is true, and there is false. Humans are made up of cells. 2+2=4. These are facts of reality, and to deny them is to accept falsities.
Even with something that is not true, you can find facts about it to use in an argument or if you are trying to persuade someone. If I said, "The spoon is silver," someone could easily say "In our perspective, it is silver. But if we went to a different planet with different substances and lighting, it could very well be blue. Does that make it blue? Or is it still silver?"
The identity of the spoon is a referent to it's reality in "THIS" world. I don't know much about color spectrum, i don't know if it is a universal law, but it's identity pertains to earth.
I believe that logic is based on how persuasive it and its supporters are about it. But with actions, logic is still based on persuasion, but it is also heavily influenced by morals. But with both actions we take, and facts about things, logic is also influenced by the current situation and surroundings.
So might is right. If the majority said 2+2=5, it makes it true. Majority reserves the power to distort reality? It is not power in number, but power in reason, power in thought.
---------- Post added 12-10-2009 at 11:31 PM ----------
All that it takes for a logical conclusion is that it follows from its premises. Thus, the moon can be made of green cheese according to logic if the premise lead to that conclusion. Logical validity has nothing to do with the truth of a conclusion other than it follows from the premises.
And, a false conclusion means a false premise. That is the power of logic