Extension of Fermat's theorem?

Click For Summary

Discussion Overview

The discussion revolves around the exploration of an extension to Fermat's Last Theorem, specifically investigating the equation x1^n + x2^n + ... + xk^n = z^n for integer values of k and n > k. Participants are considering the conditions under which this equation may have solutions, drawing comparisons to known results and conjectures in number theory.

Discussion Character

  • Exploratory
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • ACG proposes an extension to Fermat's Last Theorem, questioning for which values of k the equation x1^n + x2^n + ... + xk^n = z^n has solutions for n > k.
  • Some participants note that every number can be expressed as the sum of four squares, but this does not directly apply to the proposed extension involving fifth powers.
  • ACG mentions that while the case for k=1 is true and for k=2 is not, the status for other values of k remains uncertain.
  • Alphanumeric references links that suggest there are known solutions to the equation a^5 + b^5 + c^5 + d^5 = e^5, indicating that counterexamples exist.
  • Another participant expresses interest in finding more details about the proof or disproof of the proposed extension, indicating ongoing exploration of the topic.
  • Links to external resources are shared, including a Wikipedia page on Euler's sum of powers conjecture, which may relate to the discussion.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the extension's validity, with some acknowledging known solutions while others express uncertainty about the broader implications for different values of k.

Contextual Notes

Participants reference various mathematical results and conjectures, but the discussion remains open-ended regarding the proof status of the proposed extension and its implications.

ACG
Messages
46
Reaction score
0
Hi! I assume you all know Fermat's last theorem. Well, has anyone considered the following extension to it? Assuming we're just using integers:

We know that x1^n + x2^n = y^n has no solution for n > 2. However, what about this?

For which values of k does x1^n+x2^n+...+xk^n = z^n have solutions for n > k?

We know it's true for 1 ((-1)^2 = 1^2) and not true for 2. What about other numbers?

Thanks in advance,

ACG
 
Mathematics news on Phys.org
Every number is the sum of 4 squares. That is one known result.
 
Hi!

That's cool -- I'd wondered about that myself :)

However, that won't help here: the sum of four objects case would have to be a^5+b^5+c^5+d^5 = e^5.

ACG
 
ACG said:
Hi! I assume you all know Fermat's last theorem. Well, has anyone considered the following extension to it? Assuming we're just using integers:

We know that x1^n + x2^n = y^n has no solution for n > 2. However, what about this?

For which values of k does x1^n+x2^n+...+xk^n = z^n have solutions for n > k?

We know it's true for 1 ((-1)^2 = 1^2) and not true for 2. What about other numbers?

Thanks in advance,

ACG

Yes, I have (considered that, and also wrote a short program to try and find a counter-example).
Have you been able to find anymore details about this one (like, has it been proved, disproved, etc.)?
Thanks.
 
like, has it been proved, disproved, etc.
Alphanumeric has already posted links that contain counter examples. For example they show several solutions to [itex]a^5 + b^5 + c^5 + d^5 = e^5[/itex]
 
uart said:
Alphanumeric has already posted links that contain counter examples. For example they show several solutions to [itex]a^5 + b^5 + c^5 + d^5 = e^5[/itex]

thanks
 

Similar threads

  • · Replies 105 ·
4
Replies
105
Views
11K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 13 ·
Replies
13
Views
2K
  • · Replies 12 ·
Replies
12
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
Replies
3
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 10 ·
Replies
10
Views
3K