Zeno's paradoxes don't understand.

  • Context: High School 
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Discussion Overview

The discussion revolves around Zeno's paradoxes, particularly focusing on the concept of infinite divisibility of space and the implications for motion. Participants explore the philosophical and mathematical aspects of how a finite distance can contain infinitely many points, questioning the nature of infinity and its application in physical theories.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants express confusion about how infinite points can exist between two finite locations, suggesting that there must be a finite limit to the number of points.
  • Others argue that dividing a short distance infinitely results in an infinite number of points, leading to the conclusion that crossing such a distance is impossible.
  • The concept of the Planck length is introduced as a potential limit to how far distances can be divided, although its implications are not fully explored.
  • One participant mentions that physical theories which accurately describe reality support the idea of lines having infinitely many points.
  • There is a reference to Greek mathematics, where a point is defined as having no size, which supports the notion of infinite points along a line.

Areas of Agreement / Disagreement

Participants do not reach a consensus; multiple competing views remain regarding the nature of infinity and the implications of Zeno's paradoxes. Some express skepticism about the concept of infinite points, while others defend it based on mathematical and physical reasoning.

Contextual Notes

Participants acknowledge their varying levels of knowledge, which may affect their understanding of the concepts discussed. There are references to external sources for further information, indicating some uncertainty about the topic.

jposs
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I'm pretty sure this is the arrow guy who couldn't figure out how to cross the stream because of the infinite points between here and there. I don't get it. I how there are many more points between here and there that we can count, or comprehend, the points at the end of the days have to be finite somewhere at least in my mind. Sure, many things we try to count are as good as infinite but it seems to our knowledge no matter how big the universe is it isn't infinite, so how can the points on some random short line be truly countless?
 
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Do correct me if I'm wrong but isn't it so that when a short distance would be devided into two, into infinity you would have an infinite amount of points between here and there, there by impossible to cross the distance/stream.
 
The Planck length step the limit as to how far you can divide it up
 
rc1102 said:
The Planck length step the limit as to how far you can divide it up

Forgive my disgusting lack of knowledge in so many places, mostly through misjudged choices, I recognize the name only. So far for lack of a better term the rest is all Greek to me.
 
jposs said:
Sure, many things we try to count are as good as infinite but it seems to our knowledge no matter how big the universe is it isn't infinite, so how can the points on some random short line be truly countless?
I don't see why this is a good argument, or even an adequate one.

The good reason to "believe" that, in the universe, the number of points in a short line is infinite is that physical theories that do a good job of describing reality describe lines as having infinitely many points.
 
In maths, especially the Greek maths in those days, a point has no size only a position in space. So under this, it is reasonable to think that there are infinite number of points in a line.
 
Thinker8921 said:
In maths, especially the Greek maths in those days, a point has no size only a position in space. So under this, it is reasonable to think that there are infinite number of points in a line.

Thanks, makes different sense now.
 

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