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arXiv 1409.3595math.NTmath.CO
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素数中Roth定理的密度增量法

A Density Increment Approach to Roth's Theorem in the Primes

Eric Naslund

摘要:

证明了若$A$是满足\[ \sum_{a\in A}\frac{1}{a}=\infty, \]的素数集合,则$A$必包含一个$3$ -项等差数列.这是通过结合迁移原理与密度增量参数,利用素数的结构,以获得在迭代的每一步大的密度增加。该论证表明,对于任何$B>0$和$N>N_{0}(B)$,如果$A$是包含在$\{1,\dots,N\}$中的素数的子集,且相对密度$α(N)=(|A|\log N)/N$至少为\[ α(N)\gg_{B}\left(\log\log N\right)^{-B} \],则$A$包含$3$ -项等差数列。

英文摘要:

We prove that if $A$ is any set of prime numbers satisfying \[ \sum_{a\in A}\frac{1}{a}=\infty, \] then $A$ must contain a $3$-term arithmetic progression. This is accomplished by combining the transference principle with a density increment argument, exploiting the structure of the primes to obtain a large density increase at each step of the iteration. The argument shows that for any $B>0$, and $N>N_{0}(B)$, if $A$ is a subset of primes contained in $\{1,\dots,N\}$ with relative density $α(N)=(|A|\log N)/N$ at least \[ α(N)\gg_{B}\left(\log\log N\right)^{-B} \] then $A$ contains a $3$-term arithmetic progression.

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