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Feynman on Fermat's Last Theorem (2016)

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Re: Feynman on Fermat's Last Theorem (2016)

#31

Is anyone still trying to come up with Fermat's original "truly marvelous proof"? Or have math folk talked themselves out of its possible existence?

Some even speculate Fermat didn't write this note. Most of his works were collected by his son who is suspected of adding this commentary to a conjecture that was considered many times by Fermat.

Re: Feynman on Fermat's Last Theorem (2016)

#32

Is anyone still trying to come up with Fermat's original "truly marvelous proof"? Or have math folk talked themselves out of its possible existence?

I had a number theory professor who said there are a number of deceptively promising avenues of attack using simpler methods than Wiles, but that end up being dead ends. He said mathematicians are now mostly of the opinion that Fermat was probably onto one of these.

Re: Feynman on Fermat's Last Theorem (2016)

#33
post #2

_DON'T DOWN VOTE JUST BECAUSE YOU CAN'T DO MATH_ The proof Fermat hinted to was about the difference between squares. All whole numbers taken to a power greater than two (n^3) can be represented as the difference between two whole squares (x^2 - y^2). These differences can then be shown as the sum of consecutive odd numbers: 2^3 = 3^2 - 1^2 = (1+3+5) - (1) = 8, 3^3 = 6^2 - 3^2 = (1+3+5+7+9+11) - (1+3+5) = 27, 4^3 = 1…

Off topic: why doesn't HN support LaTeX?

Likely because MathML isn't widely supported, and has even been removed from Chrome.

Re: Feynman on Fermat's Last Theorem (2016)

#34
post #5

This proof (or "plausibility argument") bugs me so much. Just because something thins out and becomes rare doesn't mean it doesn't exist. As n gets bigger, the probability of n being a perfect square gets smaller and smaller. In the limit, the probability is zero. Does this mean square numbers don't exist?

No one is claiming that this kind of argument constitutes a proof, but this kind of back of the envelope calculation is very powerful. For example in the theory of prime numbers there is a heuristic that says that primes roughly behave like randomly selected numbers where Prob(N is prime) = 1 / log(N) [this is a simplification, but that's the crux of it]. With this heuristic you can accurately predict whether a large class of statements about primes are true or false, and can get extremely precise estimates about things like "how many twin primes are there less than N", or "how many solutions in primes are there to p1 + p2 = 2*N, for some huge N", which is one way of phrasing two famous prime number conjectures.

It doesn't lead you directly proof - but often just knowing what the answer 'should be' can be a real guiding light.

Re: Feynman on Fermat's Last Theorem (2016)

#35
post #28
post #24

Earlier quoted context omitted.

I don't think the "you can do anything" mindset works in real life. It helps self-help book authors sell their stuff, but it's not a good strategy to live by. (Incidentally, this reminds me of Key & Peele's "You can fly" sketch). What does work though is this: advanced formal education in a topic. Once you have that you can start thinking on how to solve some simple open problems. And if you are lucky and turn out to…

Oh man, that reminds me of an experience I had in college. I was working with the aerospace department on their fusion reactor (I was just writing software to help them process data from it, not involved in the science itself). My boss kept getting calls from crackpots who'd go on and on and on about their bogus theories, and how they were being shut out of the mainstream by small minded fools, etc etc. It was pretty…

[deleted]

Re: Feynman on Fermat's Last Theorem (2016)

#36
post #15

Earlier quoted context omitted.

Do you really believe that: (a) This constitutes a proof; (b) This is the "proof" that Fermat had; (c) Mathematicians missed this for over 350 year? I'm not quite sure exactly what you are claiming.

It's completely arrogant to assume that because it hasn't been solved by "better" people that I couldn't solve it.

It looks like you edited this comment, but I'm serious. I'm trying to understand your proof, but I'm having trouble seeing what the steps are for higher powers than 3 or 4. I already know the proofs for then cases n=3 and n=4, but I can't see how what you say works in the case, say, n=5, or n=13.

Seriously, can you walk us through the steps of why x^5+y^5=z^5 has no (non-trivial) solutions?

And to be fair, there are cases where, say, undergrads have proven significant results that had been outstanding for a long time. Proving that prime recognition is in P is one such case. but in that case they published a complete, clear paper. In this case I can't really see what you're saying you've done, or why it's true, which is why a walk-through of the case n=5 would be so helpful.

Thanks.

========

For anyone interested, this is what the comment used to say ...

The series of odd numbers must be consecutive and they simply are not when you add two different series together for all powers greater than two. It's okay. You'll get it.

  1) a whole number, n, taken
     to a power greater than two
  2) can be represented as a
     consecutive series of odd
     numbers
  3) where there will always be
     a gap in the series between
     consecutive base numbers,
     for all p and p+1
  4) therefore there will be
     a gap for all p and p+n,
     n>=1 combinations

Re: Feynman on Fermat's Last Theorem (2016)

#37
post #24
post #17

Earlier quoted context omitted.

What other mindset do you see working better?

I don't think the "you can do anything" mindset works in real life. It helps self-help book authors sell their stuff, but it's not a good strategy to live by. (Incidentally, this reminds me of Key & Peele's "You can fly" sketch). What does work though is this: advanced formal education in a topic. Once you have that you can start thinking on how to solve some simple open problems. And if you are lucky and turn out to…

So what your saying is... We should ignore letters from patent clerks?

Re: Feynman on Fermat's Last Theorem (2016)

#39
post #21
post #13

Earlier quoted context omitted.

I know, but it's being exhibited as an example of how back-of-the-envelope type of approximations by physicists can be just as good as rigid mathematical thinking. And I don't find this to be a convincing example of how loose physicist arguments can work. Schwartz distributions, infintesimals; okay, fine, those turned out to be a weird trick that can be formalised. But sometimes their tricks are just plain wrong and…

That’s not what’s happening. Consider, many useful primality tests are statistical in nature. It’s pure math, and exact answer is possible but it’s still useful to get a quick check to see if something is a waste of time. Really, if a full solution takes 20 years you don’t want to actually spend 20 years without having a very good idea it’s going to work.

I think jordigh is saying that the method is not statistically sound, i.e. that it will not (necessarily) give accurate probability estimates. They're not criticizing the method simply for being statistical.

Re: Feynman on Fermat's Last Theorem (2016)

#40
post #24

Earlier quoted context omitted.

I don't think the "you can do anything" mindset works in real life. It helps self-help book authors sell their stuff, but it's not a good strategy to live by. (Incidentally, this reminds me of Key & Peele's "You can fly" sketch). What does work though is this: advanced formal education in a topic. Once you have that you can start thinking on how to solve some simple open problems. And if you are lucky and turn out to…

So what your saying is... We should ignore letters from patent clerks?

No, but even those from "left field", if genuine, tend to take the time and care to write things up properly, to use the nomenclature of the field, to address obvious potential concerns up front.

If you're asserting something that's likely to encounter resistance, it's worth being clear and careful.

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