Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

The above equation has no integer solutions

Please teach me how to prove the above using the infinite descent

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,413

Hi Agnishom;

The proof is difficult.

http://fermatslasttheorem.blogspot.com/ … m-n-4.html

The proof requires the understanding of moduli. I can help with that if you want it.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

Yes Its quite complicated

See the last step .... it claims that they have reached infinite descent

How?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,413

Hi Agnishom;

Step 8?

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

Yes.. that one

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,413

Hi;

To have an infinite descent in this case you have to prove that there is always integers like the ones you started with that have the same properties but are smaller. For any finite a,b you can not keep finding integers p,q that are smaller than a,b. You must run out.

Please read this which is explaining it much better than I can.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

But now we have reached infinite descent since:

P^2 = a^2 + b^2 = p which is less than p^2 + q^2 = z which is less than z^2.

But how does this show that a and b will have similar properties as p & q??

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,413

Hi;

I think they are all squares. a^2 and b^2 and p^2 and q^2. You just have to be able to see that one group of squares is less than the other.

**In mathematics, you don't understand things. You just get used to them.**

Offline

So what?

They are squares... how does that show that there will be smaller numbers MATCHING THE ORIGINAL CONDITION?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,413

Hi Agnishom;

There I am just as confused as you are. I do not have the whole proof understood either.

**In mathematics, you don't understand things. You just get used to them.**

Offline

Thats hard to believe

(Just joking)

*Last edited by Agnishom (2012-09-13 02:51:23)*

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,413

Hi;

Math is gigantic, bobbym is tiny. That explains it.

**In mathematics, you don't understand things. You just get used to them.**

Offline

bit.ly/infdescent

Isn't this one better?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,413

Hi;

Did you know that is the method to prove your latest triangle problem?

**In mathematics, you don't understand things. You just get used to them.**

Offline

Pythagorean triangle?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,413

Yes, that link solves the other problem.

**In mathematics, you don't understand things. You just get used to them.**

Offline

Okay, imagining the two legs are perfect squares, say a^2 and b^2

We can't have a hypotenuse c such that a^4 + b^4 = c^2

But what if we are talking about one leg and one hypotenuse?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,413

Hi Agnishom;

I do not know about that one yet.

**In mathematics, you don't understand things. You just get used to them.**

Offline

Pleae explain me this: **For Euclidean Integers, relatively prime divisors of n-powers are themselves n-powers.**

(and please don't give links, I don't get them)

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,786

I do not understand the question... To have relatively prime numbers, you need two numbers.

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

Offline

Suppose, w and v are relatively prime to each other

and

The theorem claims that there exists integers x and y such that and

Example, 10^2 = 25*4 where (25, 4) are relatively prime to each other now see that 25 = 5^2 and 4 = 2^2

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**scientia****Member**- Registered: 2009-11-13
- Posts: 222

Agnishom wrote:

Suppose, w and v are relatively prime to each other

and

The theorem claims that there exists integers x and y such that and

Example, 10^2 = 25*4 where (25, 4) are relatively prime to each other now see that 25 = 5^2 and 4 = 2^2

If , take and . Otherwise, since and are coprime, each prime divisor of must divide exactly as many times as it divides , namely a multiple of times. Thus , being a product of primes of power a multiple of , is a power of . Same for .

Offline

Are you sure the proof is as simple as that?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**scientia****Member**- Registered: 2009-11-13
- Posts: 222

Do you understand it?

Offline

I still have confusions, though it looks intutively obvious

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

Pages: **1**