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10-05-2006, 03:17 PM
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Here is a link(which contains other links) which you will find interesting. It appears a math professor at Lehigh University may have solved the Navier-Stokes PDE's regarding viscosity. Check it out. MMB |
10-05-2006, 03:43 PM
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Quote:
Originally Posted by galactus  Here is a link(which contains other links) which you will find interesting. It appears a math professor at Lehigh University may have solved the Navier-Stokes PDE's regarding viscosity. Check it out. MMB | I'll admit that I was too lazy to read the article. Did he find a solution or did he prove the existance of a solution?
-Dan
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10-05-2006, 04:47 PM
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Quote:
Originally Posted by topsquark I'll admit that I was too lazy to read the article. Did he find a solution or did he prove the existance of a solution?
-Dan | Not a he, a she. Professor Penny Smith from Lehigh University. Follow the link to her paper. It was just recently submitted, I believe. It'll have to survive scrutiny by the muckity-mucks who are qualified to judge it. [math/0609740] Immortal Smooth Solution of the Three Space Dimensional Navier-Stokes System Smith's Navier-Stokes |
10-05-2006, 04:51 PM
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Quote:
Originally Posted by galactus | Ummm...I was using the "Royal he." Yeah, that's it.
-Dan
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10-05-2006, 06:21 PM
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Quote:
Originally Posted by topsquark Did he find a solution or did he prove the existance of a solution? | I know absolutely nothing about it (though heard of it). Thus, I might be completly off. But it makes no sense to say he proved existence of solution. Because Differencial equation always have solutions on continous open intervals.
---
Does Wikipedia mention it?
If not, it is probably wrong.
Like I said, people love to make false proves on website based on no understanding at all.
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10-05-2006, 07:29 PM
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Quote:
Originally Posted by ThePerfectHacker Does Wikipedia mention it?
If not, it is probably wrong.
Like I said, people love to make false proves on website based on no understanding at all. | You seem to have a lot of faith in wikipedia...
__________________ Quick's Prime Property:
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10-05-2006, 07:54 PM
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Quote:
Originally Posted by Quick You seem to have a lot of faith in wikipedia... | I have faith in Wikipedia, PlanetMath, MathWorld, MacTutor.
Because these are website that are checked.
I have absolutely no faith in regular website that people make themselves. Because I have seen so mannny mistakes.
Especially people claiming they have proofs and knowing almost no math.
I would say the same for non-math related things. You can check regular sites. But if they say something interesting/shocking you need to confirm this from a trusted website.
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10-05-2006, 11:50 PM
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Quote:
Originally Posted by ThePerfectHacker I know absolutely nothing about it (though heard of it). Thus, I might be completly off. But it makes no sense to say he proved existence of solution. Because Differencial equation always have solutions on continous open intervals.
---
Does Wikipedia mention it?
If not, it is probably wrong.
Like I said, people love to make false proves on website based on no understanding at all. | The introduction to the paper in the original link claims that the existance for solutions in 3-D hadn't been proven. The Navier-Stokes equation is a 3-D non-linear system of equations (one for each coordinate). Being non-linear I don't know if a solution has to exist. Obviously approximate and/or local solutions exist else fluid dynamics never would have been developed.
-Dan
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10-06-2006, 10:35 AM
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Why are these called "Mellenium Problems".
They are not so old.
There are only 2 real mellinium problem from the time of Euclid (more than 2300 years ago). Twin Prime conjecture. And the dangerous Odd Perfect Number
I think there is one most from the time of Pythagorus (more than 2500 years ago). I do not know who it is called, and I do not really know if it is unsolved. But I think it is. Show there is not thing as a slightly excessive number. Meaning when you add the proper divisors you obtain a number 1 more than the number you used. If what I said is true, this is the oldest unsolved problem.
It happens to be cool that the most complicated math problems involve the most basic things, the positive integers. Funny, all of these advanced PDE's eventually are solved after a some time. But these problems, which a child can understand still unsolved. Even by the greatest mathemations.
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10-07-2006, 04:19 AM
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Quote:
Originally Posted by ThePerfectHacker Why are these called "Mellenium Problems".
They are not so old.
There are only 2 real mellinium problem from the time of Euclid (more than 2300 years ago). Twin Prime conjecture. And the dangerous Odd Perfect Number
I think there is one most from the time of Pythagorus (more than 2500 years ago). I do not know who it is called, and I do not really know if it is unsolved. But I think it is. Show there is not thing as a slightly excessive number. Meaning when you add the proper divisors you obtain a number 1 more than the number you used. If what I said is true, this is the oldest unsolved problem.
It happens to be cool that the most complicated math problems involve the most basic things, the positive integers. Funny, all of these advanced PDE's eventually are solved after a some time. But these problems, which a child can understand still unsolved. Even by the greatest mathemations. | They were so called to cellebrate the new millenium, they are supposed
to be the 21st century equivalent of the Hilbert problems, but with
prize money attached. See this.
RonL
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