Does the falsity of a statement(p) necessarily imply its opposite(~p) is true? (My professor says it does imply.) — Jerin Jaison
So you might even say that soundness is analytically defined as those forms of argument which happen to preserve truth. — Moliere
Or, given that there are multiple systems of logic, we could also say that soundness is relative to some system of rules of inference, and all arguments which follow said rules of inference and also contain true premises produce sound arguments. — Moliere
It almost seems like we need to already know the truth of our premises in order for the logic to be worked out. — Moliere
Have you never heard a physicist say that a ball thrown upwards decelerates because its kinetic energy is converted into potential energy, that a faster collision makes more damage than a slower one because more kinetic energy is dissipated, — leo
I don't know who might claim that consciousness is explained by fundamental particles, but many physicists believe that they would arrive at a "theory of everything" by uniting the four "fundamental" forces into a neat unified theory, yet such a theory would still be totally unable to account for the fact that we experience anything, feel anything, and that they don't realize. It's not that it would be very complicated to derive consciousness from such a theory, it would be demonstrably impossible, and so it couldn't be a theory of everything claiming to have found the fundamental building blocks of existence. — leo
All that we do is stating that the proposition p is false. John being a girl is only one among many possibilities — Jerin Jaison
Physicists like to treat energy as an entity that has the ability to cause things, but energy doesn't cause anything, it is simply a description of motion and potential to cause motion. We don't need to talk about the fuzzy concept of energy to describe the universe, we could simply talk about particles and their motion and their ability to move other particles — leo
(even though as we talked about in your thread about physicalism such particles cannot explain the emergence of conscious experience so they cannot be all there is).
Are inference rules, such as modus ponens, disjunctive syllogism and others, possible of being proved? I mean, are they axioms, which validity is transcendental and exist by itself, or can they be deducted from the very three logical principles? — Nicholas Ferreira
That they are not known has to do keeping the experiment 'blind' so that the determinist cannot say there was unconscious interference or brain states influencing things. — EnPassant
Simply associating a number with an action, in advance of the number being known, is not physical determinism. For physical determinism to obtain it must be shown that a physical state determines the choice. The experimenter could as easily have decided that if n is the digit action n+1 will be performed. There is no rigid deterministic connection here. — EnPassant
Yes, but it is enough to show that the 'decision' is not physically deterministic. The slightest non deterministic action is enough to prove the case. It is clear enough to me that the 'choice' is determined by mathematical fact, not a physical state. But it is subtle; there are many physically deterministic threads running through this and one has to be careful to see what is deterministic and what is not. — EnPassant
But it is not just about one choice. There is a sequence of choices corresponding to the sequence of digits and that sequence cannot be decided upon because the sequence of digits is unknown. That is why there is a whole sequence of actions. — EnPassant
It's easy to have the wrong idea about what you're doing when you think about non-existent objects. Both Meinong and Russell got it wrong. Russell thought that when he wrote 'the present King of France is bald', he was claiming, falsely, that there was a real present King of France. However, he was not; he was pretending that there was a real present King of France. — Herg
If you say 'Sherlock Holmes is the world's greatest detective', this is not a true statement. We only pretend that it is true, just as we pretend that there is such an object as Sherlock Holmes. — Herg
What do you think about objects in dreams? If you dream about a horse, do you hold that there is a horse? I hold that there is not.
The reason that people present fictional things is almost never "to explain how we can speak truthfully about such things." — Terrapin Station
I assume that MindForged means that the chief reason philosophers propose non-existent objects is to explain how we can speak truthfully about such things; it's clearly not why novelists present them.
The disagreement between MindForged and myself is about the status of non-existent objects as it is hypothesised by philosophers (not by novelists, who mostly probably don't think about it). MindForged holds that we need there to be non-existent objects to explain how we can speak truthfully about them; I disagree. — Herg
That is not physical determinism. It is a 'blind' decision because the list is made before the digits are known. Physical determinism says that each physical state is, by way of the physical laws of nature determined by a previous physical state. If this is correct it must be possible to show that the value digit is determined by physical law, but that is not the case. It is determined by mathematical reality. — EnPassant
That determinism locates the digit has no relevance because it is the value of the digit that determines the choice and that value is a primitive truth, not something that is physically determined.
No, you're not saying 'pretend'; you're simply pretending. — Herg
No, there are no non-existent objects. To say that an object is non-existent is the same as saying that there is no such object. — Herg
I think you are pretending that he is real without realising that that's what you are doing. You know that he isn't real, and yet you speak of him as if he were — Herg
The story I'm referring to is not trivial. It's quite a good story. The point is that logical laws, just like physical laws, can be disobeyed in a work of fiction, as long as the resulting narrative makes sufficient sense for the reader to follow it. — Herg
See above re. the difference between applied and pure math. My point is that the value of the digit is not determined by any physical state, yet the digit determines the choice from the list. — EnPassant
That's not about whether you're pretending, it's about why you're pretending. — Herg
It's true that fiction-writers usually follow the principles of logic, but that's merely because most of what fiction-writers want to do doesn't require them to depart from those rules. They can produce fiction that doesn't follow the rules of logic if they like: for example, there's a short story - I can't remember who by - in which the rules of mathematics are not determined until someone actually does the maths, and there are aliens who have done the maths on certain numbers before we have, and they have forced maths to work differently for those numbers from the way it works for the numbers we got to first; which, of course, is not logically possible. Existent objects, on the other hand, have to follow the rules of logic. — Herg
they play the same theoretical role: explain how we make true assertions about things which don't exist.
Non-existent objects cannot be entertained unless you accept contradictory objects.
— MindForged
Could you explain that more? — Terrapin Station
Evidently I didn't make myself clear. To speak of a non-existent God is to pretend that there is a God when there isn't. Since it's a pretence, it's not bound by the laws of logic. — Herg
The second error is to suppose that a non-existent God can't have contradictory properties. Anything we think of that is non-existent is imaginary (by which I mean that we can conceive of it but it doesn't exist), and imaginary things can have contradictory properties (e.g. Meinong's round square, which is imaginary and is both round and not round); it's only things that are existent (i.e. real) that can't — Herg
Just for the record, math is a game that we play, with definitions and rules.
Math does not really exist outside of the human mind. It is simply an analytical tool that humans use to do things in an organized manner, such as count buffalo by prehistoric hunters. — hks
Yes, but it wasn't as if Catalonia was being left to pursue its own destiny without outside interference. Catalonia didn't shoot itself, it was murdered. — Bitter Crank
If we have good reason to hold one is sure over another
This is an outright contradiction. If we have good reason to hold one is sure over another, then we are dealing with refutable positions. By the measure of truth, having a reason to select one potion over another involves some sort of refutation of an opposing position. — TheWillowOfDarkness
Whatever I experience I experience as an idea in my mind. I assume that this idea is caused by an object in the external world. However, I can never experience this object itself since this object is by definition independent of my experience.
In other words, it is impossible to perceive an unperceived object by definition.
We determine what symbols mean. They have no intrinsic meaning.
Now our choice is not determined by any physical or neurological state. It is determined by purely non physical mathematical entities.
It's all about their attempt to obtain power at all costs. It has nothing to do with righteousness. To think otherwise is incredibly naive. — Hanover
And I think you'd be incredibly naive to assume things that you don't have evidence for. — Terrapin Station
Marco Rubio tried to sound like a reasonable voice on climate change despite his science denial by pointing to legislation he’s helped advance on sea level rise adaptation. But as renowned glaciologist Lonnie Thompson put it, “the only question is how much we will mitigate, adapt, and suffer.”