Is the Lim Sup of the Difference of Primes Equal to 1?

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Discussion Overview

The discussion revolves around the limit superior of the difference of consecutive prime numbers, specifically examining the expression lim sup_{n→∞} (√(p_{n+1}) - √(p_n)). Participants explore conjectures related to this limit, its potential values, and the implications of these conjectures within number theory.

Discussion Character

  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant suggests that it is possible to prove lim sup_{n→∞} (√(p_{n+1}) - √(p_n)) = 1, asking for sources or proofs.
  • Another participant questions the validity of this claim, noting that the maximum difference appears to occur at specific primes (7 and 11) and suggests that the limit may actually be zero.
  • A third participant expresses skepticism about the limit being greater than zero, challenging others to find a case where it exceeds 0.01 for large n.
  • A participant acknowledges a typo in their previous message, clarifying that they meant to suggest the limit could be zero.
  • Another participant argues that if the limit superior were zero, then the limit itself would also be zero, referencing Guy's 2004 work on unsolved problems in number theory and suggesting that the limit inferior might be zero instead.
  • This participant also mentions a mathematical relationship involving the difference of consecutive primes and logarithmic bounds, citing recent work by Goldston, Pintz, and Yıldırım.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the value of the limit superior, with multiple competing views presented regarding whether it is 1, 0, or potentially higher than 0. The discussion remains unresolved.

Contextual Notes

There are references to conjectures and unsolved problems in number theory, indicating that the discussion is based on ongoing research and unresolved questions. The mathematical relationships discussed depend on specific conditions and assumptions that are not fully explored.

Dragonfall
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Although Andrica's conjecture is still unsolved, I'm told that it is possible to prove that

[tex]\lim\sup_{n\rightarrow\infty}\sqrt{p_{n+1}}-\sqrt{p_n}=1[/tex].

Does anyone know how or can point me to a source?
 
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Who told you that was true? It looks an awful lot like the max occurs when n=4, so the primes 7 and 11 and seems to decrease from there. I've seen it conjectured that the full limit is actually zero, not much of a conjecture if the lim sup was known to be 1.
 
I can't imagine the limit being higher than 0. Heck, find a number that makes it go higher than 0.01 for n > 10^9 and I'll be suprised.
 
Yes, that was a typo. I meant 0.
 
If the lim sup was 0, then the limit would be 0. This was still an unsolved problem according to Guy's 2004 "unsolved problems in number theory".

Maybe they meant

[tex]\lim\inf_{n\rightarrow\infty}\sqrt{p_{n+1}}-\sqrt{p_n}=0[/tex]

which you can manage. Use the fact that [tex]p_{n+1}-p_{n}\leq \log p_n[/tex] is true infinitely often (much more is true actually, see Goldstom, Pintz and Yildrims recent work).
 

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