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Old 2003-07-11, 21:29   #12
trif
 
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Has anybody checked to see if the exponent itself is prime?
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Old 2003-07-11, 21:38   #13
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Quote:
Originally Posted by trif
Has anybody checked to see if the exponent itself is prime?
I found a prime tester that uses both Miller-Rabin and a prp test. Miller-Rabin judges the exponent to be composite, and the prp judges it to be prime. Dangit.
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Old 2003-07-11, 21:40   #14
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Quote:
Originally Posted by trif
Has anybody checked to see if the exponent itself is prime?
Yeah, it is. I checked that before looking for factors. I used http://www.acme.com/software/factor/.
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Old 2003-07-11, 21:53   #15
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Factoris, http://wims.unice.fr/wims/wims.cgi?l...ctor.en&cm, is a bit more rigorous than the previous link I gave and it actually certifies that 395462042351 is prime.
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Old 2003-07-11, 22:55   #16
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Guess we got lucky that the bozo didn't check for trivial factors before perpetrating this hoax.
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Old 2003-07-11, 22:59   #17
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Quote:
Originally Posted by Gary Edstrom
Maybe Dr. Elphinstone will start spamming the Internet like the person who is sending out the "The Uncertainty Principle Is Untenable" spam. I'm sure that many of you have received that one.
Maybe you've also seen the article by Thomas Gold of Cornell University who claims that solar sails won't work because they "break the laws of physics". Gold actually seems legitimate, with an impressive list of apparently genuine past achievements. His argument, based on thermodynamics, was published recently in New Scientist, a very respectable magazine with a long history.

Here's the excerpt: http://www.newscientist.com/news/news.jsp?id=ns99993895

Unfortunately, Gold's argument is faulty. He seems to have stepped into one of the many ways to misapply thermodynamical principles. Also, he evidently didn't do much of an Internet search for proper explanations of Crookes radiometer behavior.

It might be entertaining to watch Gold, Cornell and New Scientist get mud on their faces over the next few months. There's going to be a solar-sail test launch in September!
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Old 2003-07-12, 00:15   #18
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Given that there are many wrong explanations out on the Internet, that might not have done him any good. But he should have at least studied Maxwell's papers on the subject.

I wonder if hydrogen in outer space is of sufficient density to utilize the thermal edge effect that does power Crookes radiometers. Might be better to use sails made of of millions of small black discs, if you can keep the heat from becoming too much of a problem.
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Old 2003-07-12, 02:29   #19
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Is this solar sail project related to the manned space mission to the sun?

At first I was skeptical because they would get burned up long before they got close, but then I found out they are going at night...
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Old 2003-07-12, 03:18   #20
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Quote:
Originally Posted by Xyzzy
Is this solar sail project related to the manned space mission to the sun?

At first I was skeptical because they would get burned up long before they got close, but then I found out they are going at night...
:(
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Old 2003-07-12, 04:04   #21
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Default Texas A & M Aggie Joke

Fortunately or unfortunately, you just retold an old, old, old Aggie Joke.
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Old 2003-07-12, 06:01   #22
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I love silly jokes...

A guy has a cat he wants to get rid of, so he drives about five miles out of town and drops the cat off in some woods... When he returns home the cat is there sitting on the porch... The man is amazed and confused...

The next day he drives the cat twenty five miles away and drops it off in some woods... Again, when he arrives home, he sees the cat sitting there... The man is bewildered...

Finally, the next day he drives the cat one hundred miles away and drops it off in some woods, but on the way home he gets hopelessly lost so he stops at a pay phone and calls home...

"Yeah, honey? Run outside and ask that cat for some directions to get me home!"
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