关于Sárközy-Sós定理的相关表示函数
On Sárközy-Sós Theorem related to representation functions
AI总结:
本文研究了表示函数的密度分布,证明了对于任意非负数α₀,…,αₘ,存在无限多个集合A⊆ℕ₀,使得r₂(A,n)=i的n的密度为αᵢ。
摘要:
令ℕ₀为所有非负整数的集合。对于非空集合A⊆ℕ₀和整数n,h≥2,令r_h(A,n)为n表示为a₁+⋯+a_h的方式数,其中a₁≤⋯≤a_h且a_i∈A(i=1,…,h)。2016年,陈和唐证明了,对于任意给定的不同的正整数u₁,…,u_k和正有理数α₁,…,α_k,其中α₁+⋯+α_k=1,存在无限多个集合A⊆ℕ₀,使得对于所有非负整数n,r_h(A,n)≥1,并且对于所有整数i=1,…,k,具有r_h(A,n)=u_i的n的密度为α_i。本文考虑了无理数α_i的情况。主要结果是,对于任意非负数α₀,…,α_m,其中α₀+⋯+α_m=1,存在无限多个集合A⊆ℕ₀,使得对于所有整数i=0,…,m,具有r₂(A,n)=i的n的密度为α_i。还包含其他相关结果。
英文摘要:
Let $\mathbb{N}_0$ be the set of all nonnegative integers. For a nonempty set $\mathcal{A}\subseteq \mathbb{N}_0$ and integers $n,h\ge 2$, let $r_{h}(\mathcal{A},n)$ be the number of representations of $n$ as $a_1+\cdots+a_h$, where $a_1\le \cdots\le a_h$ and $a_i\in \mathcal{A}$ for $i=1,\cdots,h$. In 2016, Chen and Tang showed that, for any given distinct positive integers $u_1,\cdots,u_k$ and positive rational numbers $α_1,\cdots,α_k$ with $α_1+\cdots+α_k=1$, there are infinitely many sets $\mathcal{A}\subseteq \mathbb{N}_0$ such that $r_{h}(\mathcal{A},n)\ge 1$ for all nonnegative integers $n$ and the set of $n$ with $r_{h}(\mathcal{A},n)=u_i$ has density $α_i$ for all integer $i=1,\cdots,k$. In this paper, we consider the irrational numbers $α_i$ as well. As a main result, we prove that, for any nonnegative numbers $α_0,\cdots,α_m$ with $α_0+\cdots+α_m=1$, there are infinitely many sets $\mathcal{A}\subseteq \mathbb{N}_0$ such that the set of $n$ with $r_{2}(\mathcal{A},n)=i$ has density $α_i$ for all integer $i=0,\cdots,m$. Other related results are also contained.
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