If a set consists of concrete objects, then it has the order that those concrete objects have, and no other order — Metaphysician Undercover
If a set consists of concrete objects, then it has the order that those concrete objects have, and no other order — Metaphysician Undercover
No, Tones was referring to the principle called "the identity of indiscernibles", which is completely different from the law of identity. The law of identity makes a thing's identity the thing itself, the identity of indiscernibles associates a thing's identity with the thing's properties. These are fundamentally different principles. — Metaphysician Undercover
No, you simply fell for the sophistry. Tones is very good at it, and apt to convince others, earning the title "head sophist". — Metaphysician Undercover
So, a set is a mathematical structure. — Metaphysician Undercover
How do you make this consistent with the head sophist's claim that the members of The Beatles is a set, and the particles which make up a rock is a set? The sophist says "the set whose members are all and only the bandmates in the Beatles has 24 orderings". Notice that this is not stated as possible orderings, it is stated as the "orderings" — Metaphysician Undercover
Remember your schoolkid example? — Metaphysician Undercover
You recognized that the objects which bear that name have what you called SOME order, and this is an expression of the condition which they are actually in, at any point in time. I would call this their "actual order". — Metaphysician Undercover
No, Tones was referring to the principle called "the identity of indiscernibles", which is completely different from the law of identity. The law of identity makes a thing's identity the thing itself, the identity of indiscernibles associates a thing's identity with the thing's properties. These are fundamentally different principles. — Metaphysician Undercover
No, you simply fell for the sophistry. Tones is very good at it, and apt to convince others, earning the title "head sophist". — Metaphysician Undercover
So, a set is a mathematical structure. — Metaphysician Undercover
How do you make this consistent with the head sophist's claim that the members of The Beatles is a set, and the particles which make up a rock is a set? The sophist says "the set whose members are all and only the bandmates in the Beatles has 24 orderings". Notice that this is not stated as possible orderings, it is stated as the "orderings" — Metaphysician Undercover
Remember your schoolkid example? — Metaphysician Undercover
You recognized that the objects which bear that name have what you called SOME order, and this is an expression of the condition which they are actually in, at any point in time. I would call this their "actual order". — Metaphysician Undercover
Can you see what the head sophist has done? The sophist has removed any distinction of an actual order, to say that the group, or set, has 24 orderings, and all these orderings are equal, or the same, being in each case a different presentation of the same set. But you and I recognize, that in reality there is "SOME order", an actual order, which is the order that the objects are actually in, at any given point in time. The sophist might talk about 24 orderings, but you and I recognize that if these 24 account for all the possibilities, only one of those possibilities represents the very special "actual order", and, that since these elements are physical objects, there must be an actual order which they are in, at any given time. — Metaphysician Undercover
The law of identity is very important to recognize the actual existence of a thing, and its temporal extension. — Metaphysician Undercover
Through time a thing changes, and the law of noncontradiction stipulates that contradicting properties cannot be attributed to the same thing at the same time. So if a specific group has ordering A at a specified time, that is a property of that group, and it surely cannot have ordering B at the same time. The head sophist claims that the specified group has 24 orderings, all the time (as time is irrelevant in that fantasy land of sophistry). Obviously the head sophist has no respect for the law of noncontradiction, and is just making contradictory statements, in that sophistic fantasy. — Metaphysician Undercover
That is what happens when we allow that abstractions such as mathematical structures have an identity. Inevitably the law of noncontradiction and/or the law of excluded middle will be violated. Charles Peirce did some excellent work on this subject. It's a difficult read, and you've already expressed a lack of interest in this subject/object distinction, so you probably don't really care. Anyway, here's a passage which begins to state what Peirce was up to. — Metaphysician Undercover
The relevance of all this to the principles of excluded middle and contradiction is as follows. Peirce wrote that “anything is general in so far as the principle of excluded middle does not apply to it,” e.g., the proposition “Man is mortal,” and that “anything” is indefinite “in so far as the principle of contradiction does not apply to it,” e.g., the proposition “A man whom I could mention seems to be a little conceited” (5.447-8, 1905). If we take Peirce to have meant LEM and LNC, then it appears that he wanted to deny the principle of bivalence (according to which all propositions are true or else false) with regard to universally quantified propositions, and that he meant to claim that existentially quantified propositions are both true and false. But why think that “Man is mortal,” which seems to be straightforwardly true, is neither true nor false? And why think that one and the same proposition, “A man whom I could mention seems to be a little conceited,” is both true and false? Once we see what Peirce meant by “principles of excluded middle and contradiction,” we see that this is not what he was claiming.
— Digital companion to C. S. Peirce — Metaphysician Undercover
This is blatantly untrue, and as demonstrated above, if we assign "identity" to a set, the law of non-contradiction will be violated. — Metaphysician Undercover
The law of identity enables us to understand an object as changing with the passing of time, while still maintaining its identity as the thing which it is. — Metaphysician Undercover
Sets have distinct formulations existing all the time, which would cause a violation of the law of noncontradiction if we allow that a set is subject to the law of identity. Therefore we must conclude that sets are not subject to the law of identity. The type of thing which the law of identity applies to is physical objects. And there is obviously a big difference between physical objects and sets, despite what head sophist claims. — Metaphysician Undercover
You also have no problem with contradiction, it seems. — Metaphysician Undercover
This tells me nothing until you explain precisely what ∈ means. [/math]
is an undefined primitive of set theory. Its behavior is defined by the axioms.
— Metaphysician Undercover
To me, you are simply saying that x is an element of y if x is an element of y. What I am asking is what does it mean "to be an element". — Metaphysician Undercover
If we go with this definition, you ought to se very clearly that sets, as categories, abstract universals, do not have an identity according to the law of identity. A category is not a thing with an identity. — Metaphysician Undercover
Obviously this does not work. As you said already, elements are often sets. Therefore you cannot characterize the set as an abstract universal, and the element as an abstract particular, because they're both both, and you have no real distinction between universal and particular. — Metaphysician Undercover
There's no point in trying to justify the head sophist's denial of reality. — Metaphysician Undercover
If "Cinderella" refers to a particular, an instance of the category "fairy take characters", then that is a physical object. — Metaphysician Undercover
If "Cinderella" refers to a further abstract category, like in the case of "red is an instance of colour", then it does not refer to a particular. The head sophist seems to have convinced you that you can ignore the difference between a physical object and an abstraction, but you and I both know that would be a mistake. — Metaphysician Undercover
If a set consists of concrete objects, then it has the order that those concrete objects have, and no other order. — Metaphysician Undercover
And exactly what order is that? — tim wood
Set consisting of three balls colored red, white and blue. They also have differing weights. What is THE order? Just curious. — jgill
Then the crank, in his usual manner of self-serving sophistry, misconstrues fishfry. fishfry didn't contradict that the law of identity is different from the identity of indiscernibles. — TonesInDeepFreeze
It is not any more a contradiction for a set to have more than one ordering than it is a contradiction for a person to own more than one hat. — TonesInDeepFreeze
Set consisting of three balls colored red, white and blue. They also have differing weights. What is THE order? Just curious. — jgill
And exactly what order is that? — tim wood
Ok this is interesting. My quote was, "Sets are subject to the law of identity." So that if X is a set, I can say X = X without appealing to any principle of set theory.
Tones convinced me of that. Now you say that he only sophisted me. How so please? If X is a set, how is X = X not given by the law of identity? You have me curious.
You think I'm a victim of Tones's sophistry. That is an interesting remark. — fishfry
Set theory is a mathematical structure. The analogy is:
Set theory is to group theory as a particular set is to a particular group.
But a set is a mathematical structure too, since the elements of sets are other sets. — fishfry
This is true about kids in playgrounds, NOT mathematical sets. You have informed me that you don't like real-world analogies so I no longer use them. Mathematical sets have no inherent order. — fishfry
A temporal extension. You are saying it only applies to things that exist in time? Meaning not sets? I don't think that's right. Any set is identical to itself and also equal to itself by virtue of the law of identity. — fishfry
Tones did explain that to me, but not via sophistry. He asked me to prove the transitivity of set equality. Once I attempted to do that, I realized that I needed not the axiom of extensionality, but its converse. And that converse is true by way of the law of identity from the underlying predicate logic. This I discovered for myself when Tones pointed me to it. — fishfry
I tell you that a set has no inherent order; and that the set of natural numbers in its usual order; and the set of natural numbers in the even-odd order say -- 0, 2, 4, 6, ...; 1, 3, 5, 7, ... is exactly the same set. It is a different ordered set, because in an ordered set, the order is part of the identity of the set. In a plain set, it's not. This is how mathematicians play their abstraction game. — fishfry
Yes, well, discussions of denying LEM don't interest me much. I'll agree with that. But I've come by it honestly. I've made a run at constructivism and intuitionism more than once. I've read Andrej Brauer's "Five Stages of Accepting Constructive Mathematics." It doesn't speak to me. The paragraph you quoted is a little above my philosophical pay grade. Perhaps you can explain its relevance to the topic at hand. — fishfry
I don't see why. If X is a set, then X = X by identity. — fishfry
There is no time in set theory. Mathematics is outside of time, or talks about things that are outside of time. — fishfry
But given particular instances of set theory; that is, sets; we can ask if they are equal to each other or not.
So I promise not to say that the universe of sets is equal to the universe of sets. Though the category theorists will probably disagree with you. — fishfry
You are distorting what I said. ANY particular set is a particular instance of the concept of set, as any particular apple is an instance of the concept (or category) of apple. That causes no problem. — fishfry
If a set consists of concrete objects, then it has the order that those concrete objects have, and no other order
— Metaphysician Undercover
And exactly what order is that? — tim wood
However those objects relate to other objects, the context, or environment they are in, dictates their order. — Metaphysician Undercover
It appears, then, that one and one and no other is actually a many. — tim wood
It appears, then, that one and one and no other is actually a many.
— tim wood
Sorry tim, I'm not picking up what you're putting down. — Metaphysician Undercover
Very nice. How toxic of you, MU. But note that what I "put down" is just what you put down, I merely asking you to make sense of it. — tim wood
I'm not trying to be toxic, only I have no idea of what you are trying to express. — Metaphysician Undercover
If a set consists of concrete objects, then it has the order that those concrete objects have, and no other order
— Metaphysician Undercover
And exactly what order is that?
— tim wood
However those objects relate to other objects, the context, or environment they are in, dictates their order.
— Metaphysician Undercover — tim wood
Yikes. — TonesInDeepFreeze
As they can relate in multiple ways, it would seem, according to you, they can have more than one order. Thus you say they have one order and no other, and yet many. — tim wood
There is either one order or there are many. Which?However those objects relate to other objects, the context, or environment they are in, dictates their order. — Metaphysician Undercover
Of course it does. Or, if you are quite sure it doesn't, which one is right and how do you know?An object does not exist in a multitude of distinct contexts at the same time, — Metaphysician Undercover
and the order would be the three balls. Right? — javi2541997
This is not more than one order, it is just different aspects of one order — Metaphysician Undercover
dissing me with passive aggressive faint praise as a way to diss the other poster — TonesInDeepFreeze
Three billiard balls on a billiard table: what is their "natural" order? Three battleships at sea, what is their "natural" order? Three horses in a field, what is their "natural" order? Or, one billiard ball, one battleship, one horse, what is their "natural" order? What is "natural" order? And if there is one only and no other order, and that order depends upon their "context," their "relation" to other objects, or their "environment," what exactly are "context" and "environment," and "relation" that they are so singularly determinative? How do these disparate things establish one and one only order? And how do you know?You appear to be mixing up the natural order — Metaphysician Undercover
I came to this topic hoping to learn anything about set, order, infinite — javi2541997
Your positions and answers are quite good — javi2541997
There's plenty of detailed information and explanation posted in this thread.
If you have any questions, or wish to learn more, then it's as simple as asking. — TonesInDeepFreeze
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