"Tending towards infinity" means counting through the natural numbers - the set is infinite. The process has no end.Can we not count the intervals starting with 1? Would that number not tend towards infinity given time is infinitely divisible or approach a certain value and terminate given a smallest sliver of time exists? — ToothyMaw
So they don't want a better government, better economic policies, or better anything. What they want, is to bring down the whole system, because they don't accept the principles on which it was founded. — Wayfarer
What I can't figure out is, what Trump voters think they're voting for. — Wayfarer
I agree with this much, but disagree with suggesting that theI don’t think it entails nihilism and fatalism, but it does set the grounds for them. — NOS4A2
I disagree because this sense of responsibility is a part of our mechanism, and contributes to our choices. This is in spite of the fact that all of our decision-making components originated outside ourselves. Indeed, we aren't responsible for our genetic makeup, don't fully control what we learn, are (somewhat) slaves to our conditioned responses, etc, but we still make the choices that we make. As the decision-maker, there is inherent responsibility for those decisions. We hold others accountable, and we ought to hold ourselves accountable. Accountability never means the past can be changed; it is only about the future decisions we (or others) will make. So what if we couldn't have made a different decision in that instant within its circumstances? We can learn from the consequences, and this can result in better decisions in the future.... implications of determinism...[are] that they have zero responsibility.
Infinity is not reached. You're not considering what it means to be infinite in this context: it means continually dividing the remaining time (prior to the 1-minute mark) in half. Because the remaining time corresponds to a real number line, the process proceeds without ending because the remaining time is infinitely divisible. It's limited by the fact that all points of time that are reached by the process are less than 1 minute- so it is logically impossible for this process to reach the point of time of 1 minute.Since x reaches infinity at time 1, all steps are completed at that time, so the task is complete — noAxioms
I also think you are misinterpreting the meaning of limit.
— Relativist
On a forum our words must speak for themselves. But in this instance I can assure you that nothing could possibly be farther from the truth. — fishfry
So...you're thinking of a limit in a vauge way ("symbolic"), and vaugely asserting the series "reaches" infinity, and then rationalize this with a mathematical system that defines infinity as a number.You can think of it that way. Or you can think of it "reaching" its limit at a symbolic point at infinity. Just as we augment the real numbers with plus and minus infinity in calculus, to get the extended real numbers — fishfry
Physics indeed is not exempt from logic. It's logically impossible to reach the 1 minute mark when all steps (even if there are infinitely many of them) fall short of the 1 minute mark....like physics is somehow exempt from mathematics (or logic in Relativist's case) or something. — noAxioms
This ignores the fact that your genetic makeup, experiences, etc comprise you. That particular group of cells performs functions, including the cognitive functions of making choices.But you don't get to "give meaning to the factors" if it's all deterministic. Your genetic makeup, experiences, etc., give everything meaning to the group of cells referred to as Relativist. — Patterner
I agree that the process is, in one sense, programmed, but you are the program. There's also a sense in which you aren't programmed: you aren't the product of design. You weren't built in order to perform the functions you execute.when you are in a situation where different directions are taken by different people, the meaning that all those factors have determined you have determine which direction you take.
You do go through a "process" yes. But (while I'm not saying you did so deliberately) note how your wording even implies ultimate passivity. — ENOAH
You're pointing to the limit of a mathematical series. A step-by-step process does not reach anything. There is no step that ends at, or after, the one-minute mark. Calculating the limit does not alter that mathematical fact.You are falling into the trap of thinking a limit "approaches" but does not "reach" its limit. It does reach its limit via the limiting process, in the same sense that 1/2, 3/4, 7/8, ... has the limit 1, and 1 is a perfectly good real number, and we all have had literally billions of experiences of one second of time passing. — fishfry
No, I didn't. I said the stair-stepping PROCESS doesn't reach the 1 second mark. Are you suggesting it does?You just said to me that one second of time can't pass; and this, I reject. Am I understanding you correctly? — fishfry
You do go through a choice-making process, don't you? For important decisions, you may deliberate for a time, weighing the pros and cons of alternatives. Your beliefs and whims will factor in, as will your hopes, desires, risk tolerance - all influenced by your genetic makeup. But all those factors are intrinsic to who you are.But if the choices are determined, then are they really choices? — Patterner
Of course, whatever choice you make could not have been different at the point you make it, given your life-history. But you will also learn from the consequences of your decision, adding factors that will influence future choices. This is why I have previously argued that moral accountability is at least somewhat reasonable: future behavior is influenced by reward/punishment.If determinism is true, and the person's genetic makeup, upbringing, other past experiences, health at the moment, and all other factors, will allow only one option — Patterner
Even if determinism is true, we still make choices. It's true that those choices are a product of prior events, but the choices are still made - and we are the agents making them.If it really is the case that everything that happens couldn’t help but happen and people’s choices aren’t truly free, then those who believe life is meaningless and morality doesn't exist have no choice but to believe that. And nobody has any choice but to live their lives as they do in response to that. — Patterner
First of all, I agree with everything you said. Regarding the above, I don't think determinism (per se) is inconsistent with the existence of objective moral values (OMVs). On the other hand, materialism is inconsistent with OMVs, because OMVs are not material objects.As hotly contested as the topic is I can’t recall a philosopher ever using the deterministic nature of the universe as evidence that good and evil don’t exist and the lives of sentient beings have no actual value. — Captain Homicide
1. A given halfway step cannot reach the goal.
2 There is a specific step that reaches the goal (per PSA)
3 Therefore this final step is not a halfway step (1 & 2)
4 Any given step is halfway (per Zeno)
You don't find this contradictory? — noAxioms
Sure. You have to agree the PSA is true for finite tasks. Is there something different about infinite tasks? It doesn't seem so: consider the process: stepping increasingly closer to temporal point in time 1, but the process never actually reaches it. So the goal is unreachable by the process.Demonstration that immediate contradictions arise from denying either of the premises or presuming your conclusion 3 is also more than just handwaving. — noAxioms
No need. I understand that the math shows that the series reaches a point of convergence at time 1. However: the kinematic process never actually reaches time 1. That's why the series doesn't adequately account for the kinematic process -and why I've stressed we need to examine the process, not just do the math on the mathematical series.I'm not enough of the mathematician to regurgitate all the axioms and processes involved in the accepted validity of the value of a convergent series. — noAxioms
On the contrary, there's a logical impediment to reaching the goal through the process: the process does not reach time 1.no impediment to the reaching of the goal has been identified, — noAxioms
I'm actually basing my claims on real analysis, which analyzes the characteristics of real numbers - including the associated infinities.You do seem to heavily rely on definitions that come only from finite logic — noAxioms
That makes no sense. The process does not have a final moment. because there are infinitely many moments prior to time 1. There is no end to the series of kinematic steps, in spite of the fact that the mathematical series converges.There is a temporal end to it, a final moment if not a final step. — noAxioms
Why not?Relativist: "But this process has a 1:1 correspondence to the supertask -- for every step taken in one scenario, there's a parallel step taken in the other. This suggests that either they both complete, or neither completes."
There is a bijection yes. It does not imply that both or neither completes. — noAxioms
No it can't - that is logically impossible. The process entails taking steps with increasing shorter durations: 1/2 second, 1/4, 1/8,.... The process can only approach 1, it can never reach it.Relativist: "The number line in question is an interval that is open on the right: i.e. it includes all points <1, but not including 1. There are infinitely many points in this interval, but the point "1" isn't one of them. So the process cannot reach 1, and 1 is the goal of the process."
The 'process' can go beyond the end of the line despite it ending before the goal. — noAxioms
No! Each new step is half the duration of the last step, and this halving process has no end.. The kinematic process isn't restricted to only points on the number line.
I disagree with this. IMO, morality is rooted in empathy. It feels wrong to hurt another person, because we empathize with the one who is hurt. The golden rule formalizes this into a "moral law" of sorts. Assessing what is morally good becomes trickier as situations become more complex, and often there's moral ambiguity - partial goods and partial evils. This opens the door for the perceived "disenfranchisement of the weak" in those cases. It's worthwhile to debate those cases, but I disagree that all moral law should be assumed to motivated by such a cynical motive.Moral law is an invention of mankind for the disenfranchisement of the weak. — Jack Cummins
She's not being immoral, she's being cautious - perhaps overly cautious. Why deal in materials that she has suspicions about? Perhaps her suspicions are irrational, but is that relevant?She said that as it is a charity supporting children, they will not stock CDs, in case there has been any exploitation of children in the making of the music'. — Jack Cummins
This is similar to the charity lady scenario only in that it seems rooted in ignorance and irrationality, but it differs from from the charity scenario in that it represents a movement to generally restrict access to pornography, whereas the charity lady was just choosing not to participate in something she was suspicious about.It made me think of the previous movement of the 'moral right', as represented by Mary Whitehouse, which argued against pornography and art forms which showed forms of violence. It is based on forms of moral absolutism and what is acceptable being enshrined as 'moral law'. — Jack Cummins
No, you didn't. You merely asserted: "The PSA statement (that there is a step that reaches the goal) directly violates the premise that any given step gets only halfway to the goal." There is no direct violation.Or the PSA is correct, and the goal can't be met.
— Relativist
I showed that for a supertask, the PSA is not correct. So no, this cannot be for a supertask. — noAxioms
Fair enough, I misstated it. The process does not continue forever, however there is no end to the process.If the process continues forever, by definition it isn't a supertask. — noAxioms
My point was that the kinematic stair-stepping process has a temporal element that is not reflected in a number line.Points on a number line exist concurrently (in effect).
— Relativist
I don't know what is meant by this. 'Concurrently' means 'at the same time' and there isn't time defined for a number line.
A number line seems to be a set of ordered points represented by a visual line. It can be defined otherwise, but functionally that seems sufficient. It being a visual aid, it seems physical, but a reference to the simultaneity of the positions along the line seems irrelevant to the concept. — noAxioms
Or the PSA is correct, and the goal can't be met.The PSA statement (that there is a step that reaches the goal) directly violates the premise that any given step gets only halfway to the goal. — noAxioms
I'm not merely asserting it. You have to agree that a final step is necessary for completion when there are finitely many steps. Why would it matter if the number of steps is infinite?Relativist: "Simply denying a final step is necessary doesn't make it so."
Simply asserting that such a step is necessary doesn't make it so — noAxioms
Here's how: the infinity is manifested as a never-ending kinetic process.Relativist: "you have to explain why it's not necessary for a kinetic task to require a final step in order to be completed."
I don't know how the task being 'kinetic' changes the argument. — noAxioms
Yes, the PSA entails taking a final step. We agree infinity is not a number, so there is no final step.Doing successive steps does not get you past the tortoise unless the passing of the tortoise is done by one of the steps. That's the same as suggesting a final step, which suggests that infinity is a number. — noAxioms
Show the PSA is false.I cannot buy into that PSA statement.
Why? The claim is indeed justified by the necessity of a final step for completion. Simply denying a final step is necessary doesn't make it so - you have to explain why it's not necessary for a kinetic task to require a final step in order to be completed.But I'm making the stronger claim that it is logically impossible.
— Relativist
I'm trying to get a justification of that claim without the addition of the necessity of a final step, which would by definition be contradictory. — noAxioms
In the case of Achilles, we know that the task can be completed, but it is presented to us in a form in which it cannot be completed. I mean that we know that Achilles will pass the tortoise and even calculate when with simple arithmetic (no infinities required). — Ludwig V
We can assign those numbers as we take each step. That's counting, and it's perfectly meaningful.Countably infinite means that any step can be assigned a number. It does not in any way mean that there is a meaningful count of steps. — noAxioms
OK, but speed of light limitations put a physical limit on how fast the stairs can be descended, so that it eventually becomes physically impossible to descend a step in the prescribed period of time. The minimum size limitation also relates to a physical impossibility. But I'm making the stronger claim that it is logically impossible.Physical (fixed size) stairs are of infinite length, and such a distance cannot be traversed in finite time. If the stairs get smaller as we go, then we get into the physical problem of matter being discreet, not continuous. Hence the steps have a minimum size. That's what I mean about physical stairs not qualifying as a supertask. — noAxioms
The entire exercise is abstract, but the scenario is written in terms of the kinematic (not abstract) process of descending stairs: each step is a motion, taking place in a finite amount of time.Relativist:"The mathematical series completes, but this is an abstract, mathematical completion. The kinetic activity of descending the stairs does not complete."
Again, the stairs is utterly abstract. There's no kinematics to it. — noAxioms
Taking a single step is an act. The acts are performed in a sequence (from step n to step n+1). The term (sequence) is not referring to the entire collection. The task is to reach the bottom of the stairs (as stated in the description in the first post of this thread). Perhaps you can already see that it's trivial: it's actually impossible to reach the bottom of the stairs, since there is no bottom to a staircase with infinitely many stairs.PSA:The performance of a sequence of successive acts does not complete a particular task unless it is completed by the performance of one of the acts in the sequence.
I cannot parse this. What is an 'act' that is distinct from a 'task'? The word 'sequence' seems to refer to the entire collection.
A 'task' (what, one of the steps??) is not completed by a performance unless 'it' (what, the performance?, the task?) is completed I cannot follow it at all. — noAxioms
Correct.Am I right to think that you are not saying that all the stairs can be counted, even though any stair could be included in a counting sequence? — Ludwig V
I think it's because they are interesting puzzles, and because they help teach certain concepts.That's true. What puzzles me is why they are not dismissed out of hand. — Ludwig V
Yes- that's a better way to describe it.Wouldn't it be more accurate to say that descriptions of the supertasks are the source of the illusion that there could be a mapping of that mathematical series into the actual kinematic world? — Ludwig V
The allure of supertasks is the illusion of being able to complete an infinite process in a finite amount of time. I'm not sure there's anything comparable.More than that, surely, there can be a mapping of some mathematical series into the actual kinematic world. Perhaps some similarity between those series is what creates the illusion?
This is a thread about the religion Flawlessism. If you actually knew that religion you would know that your argument has no basis because of what I'm referencing to. If you don't know what Flawlessism is then don't comment. — Echogem222
My point is that the stairs are countably infinite. Consequently, they COULD be counted, if we were traversing them.I had not mentioned a completion of a count. The supertask is to complete all steps, not to count them, and not to complete a specific step that is nonexistent. — noAxioms
Yes, the sequence of defined temporal points (1/2, 1/4, 1/8...) is a series, but the mathematics that identifies the limit does not take into account the kinematics of the task. Supertasks describe a conceptual mapping of the abstract mathematical series into the actual, kinematic world - regardless of whether or not you wished to consider it.The series (say the time needed to complete all tasks) converges. The count does not.
It fits this definition:The physical process of descending stairs is not a supertask. — noAxioms
The goal of removing all the marbles will therefore never be met if there are at least 2 green marbles, and it will rarely met even if there is only 1. How does this relate to a supertask that allegedly completes?Cheap example: You have a bag with a modest quantity of red, blue and yellow marbles in it. The goal is to remove them all. The task is deemed to be complete when the green marble is removed. Such a task cannot be completed by that definition of complete. — noAxioms
The article discusses the issue:I notice the SEP article correctly doesn't claim that the last step is taken. — noAxioms
Yes, it's a cop-out because it ignores the kinematic process. Stating this in terms of the PSA gives you something specific to address, if you want to not cop out.Relativist: "Your preferred perspective ignores this - or pretends there can't be a final step because that introduces a contradiction."
There being a final step leads directly to contradiction, and you say I'm copping out by pretending there isn't a final step? — noAxioms
I agree we can't treat infinity as a number, and haven't suggested you should. But for the supertask to be meaningful, you have to identify where infinity fits in the kinetic task description. I'm saying it entails a never-ending sequence of tasks. Identifying the limit doesn't make this disappear.Relativist: "For the scenario to be coherent, BOTH view of completeness have to be true."
I cannot accept this assertion. I cannot accept a view of completeness that treats infinity as a specific number. — noAxioms
I think you're referring to the limit:There are some number systems that define division by zero as a/0=∞. — Michael
Please clarify what you mean. Are opinions not beliefs?Rather, opinions are propositions that are not truth-functional. — Lionino
How do we decide what is fact and what is opinion? — Truth Seeker
The premise that the universe "popped into" existence is incoherent. It implies there existed something, into which the universe popped.Things don't pop up for no reason, in fact, that is an assertion that implies a cause(in this case, 'no reason'). Given this, it is wiser to assert that the universe came into existence by some manifestation in, per se, a multiverse, than it is to park randomly on the conjecture it just popped up for no reason — Barkon
Yes- and that's because the role of infinity in the task. The task entails a sequence of events, so the infinity can only mean an infinite chain of events - one after another without end.the process of counting steps is not completable
— Relativist
Are you suggesting that supertasks cannot be completed? — keystone
Wrong. The statement (the completion of a consecutive series of physical steps entails a final step) is necessarily true. When we consider this statement in conjunction with a statement about the series being "complete" (in terms of convergence) we introduce a contradiction. This is the point! These statements cannot both be true, but both are entailed by the scenario.if a physical process ends, there has to be a final step.
— Relativist
This is equivalent to asserting that 'infinity' is the largest integer. — noAxioms
The SEP article says:But as Thomson (1954) and Earman and Norton (1996) have pointed out, there is a sense in which this objection equivocates on two different meanings of the word “complete.” On the one hand “complete” can refer to the execution of a final action. This sense of completion does not occur in Zeno’s Dichotomy, since for every step in the task there is another step that happens later. On the other hand, “complete” can refer to carrying out every step in the task, which certainly does occur in Zeno’s Dichotomy."
The definition you appear to be using is the former, which is why Michael's one-digit counter doesn't have a defined output after the minute expires. — noAxioms
I agree with this, but this simply ignores the implication of the physical process of step-counting. For the scenario to be coherent, BOTH view of completeness have to be true. But they aren't - so the scenario is actually incoherent.I've been using Zeno's definition of complete: That every step has been taken. Given that definition, the supertask can be completed. — noAxioms
Right! It's not the sequence described in the scenario! There is a background temporal sequence, as the clock ticks, that reaches 1, but we aren't mapping the step counting to the ticks of the clock. The step-counting sequence occurs only at points of time <1. In real analysis, this is called a "right open interval" (i.e.it's open on the right= the endpoint is not included in the interval). 1 is the endpoint, but not included within this interval.As I have been explaining in this thread, you can conceptually adjoin the limit of a sequence to the sequence, as in 1/2, 3/4, 7/8, ..., 1. This is a perfectly valid mathematical idea. This is a representation of the ordinal ω+1
+
1
. In this case, 1 is indeed the "last term," although to be fair, you can no longer call this a sequence, since a sequence by definition is order-isomorphic to the natural numbers. — fishfry
The limit of the series is "reached" only in the sense that we can reach a mathematical answer. The physical process of sequentially counting steps, doesn't "reach" anything other than increasingly higher natural numbers. Deriving the limit just means we've identified where the sequential process leads. In this case, we've derived that the limit is infinity- but what does infinity correspond to in the scenario? The meaning is entailed by the fact there are infinitely many natural numbers, so it means the process continues without end. It can mean nothing else.By definition, a limit is not reached, it is approached.
— Relativist
That is sadly a misunderstanding very common among calculus students. So lot of smart people, physicists and engineers and other scientists, have this belief.
In fact a limit IS reached. A limit is exact, it's not merely approached or approximated. It is literally reached.
It's not reached by a single step. Rather, it's reached by the limiting process itself. — fishfry
The lesson is that the defined supertask (the fictional, physical process) is logically impossible,
— Relativist
The lamp and staircase scenarios are physically impossible. What law of logic makes them logically impossible? — fishfry
I'm asserting that an infinite process is necessarily never completed - by definition.the process of counting steps is not completable
— Relativist
Are you suggesting that supertasks cannot be completed? — keystone
The scenario describes a fictional, physical process. The lesson is that the defined supertask (the fictional, physical process) is logically impossible, but this isn't apparrent when considering only the mathematical mapping.There is no physical process. — fishfry
That's because the physical steps map to an infinite series in an interval with an open boundary. One can't simply declare there's no final step because the mapping implies there isn't. The taking of steps is a repetitive physical process, and if a physical process ends, there has to be a final step.Certainly the relationship between time (independent of human control) and physical steps taken over a period of time has ended. — jgill
Consider a devotee of Infowars, who routinely accepts conspiracy theories. Aren't you suggesting they should trust their opinions?We of course have the ability to develop our skills of thinking things through, analyzing our opinions and assumptions, and considering other perspectives. But there is a difference between ensuring what you say is correct, and how you conduct yourself in and after saying it. So to say you should “not trust your mind” (yourself)—as I, and Emerson, argue against above—is perhaps different than saying you should not trust the opinions you have or inherited. — Antony Nickles
Mathematically, this sequence as a limit of 1.
The sequence never "reaches" 1; nor is there a last step. Neither of these statements is controversial once you understand what a limit is. Sadly, most people have never taken calculus; and most students who take calculus never really learn what a limit is — fishfry