Hilbert's Hotel
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Re: Is movement impossible?
[Re: PHeMoX]
#154132
09/22/07 00:19
09/22/07 00:19
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Joined: Oct 2006
Posts: 1,245
AlbertoT
Serious User
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Serious User
Joined: Oct 2006
Posts: 1,245
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Quote:
The paradox doesn't say anything about time, except that speed will logically slow down.
The original paradox speaks of time Zeno claimed that an arrow will never reach its target because it will take an infinite time to reach the target for the raeson already discussed
This is false also from a logical point of view even though it seems to make sense The reason being that the sum of infinite terms can be a finite value It may be not intuitive but it is like that
Why should speed logically slow down ?
Speed is given by : distance / time Distance gets smaller and smaller but also time does the same , so their ratio can remain constant along the path
In modern math "Infinity" must be understood as a "actual " number it is not a "potential" number Infinity in math must not be understood as something that is growing and growing This is the common idea of infinity
I made the example of the diagonal of the square It is measured by the irrational number
d = sqrt(2) = 1.4121....
this number never ends if you trunk it even 1.000.000.000 positions after the decimal point you get a segment that is shorter than the diagonal of the square
Would you claim that the diagonal of a square does not exist, then?
No the diagonal exists same as the infinite number which is its measure it is not a potentiality it is a reality
These arguments are valid in the domain of the logic and math In this domain and in this domain only the Zeno's paradox make sense and consequently can be solved In the domain of physics it simply does not make any sense
How would you define for example the event :
the arrow hits the target
The arrow has a dimension, which part of the arrow should hit the target to trig the event ? The tip of the arrow , maybe ? Well , the arrow is made of atoms Ok , let's say the more external atom of the tip of arrow hits the target The atom is made of protons and neutrons Ok the most external proton or neutron of the most external atom of the tip of the arrow hits the target The proton has a dimension Ok, the baricenter of the most external atom of the most external proton hit the target OK that's clear now, but a baricenter is not physical entity , the baricenter is a mathematical entity
You are again back in the domain of logic and math and you have already got the solution
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