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arXiv math/9704220math.CO
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连分数与唯一可加划分

Continued Fractions and Unique Additive Partitions

David J. Grabiner

摘要:

将正整数分成集合$A$和$B$ { \em避免},如果在$S$中同一部分中没有两个不同的元素有和,则为集合$S\subset\N$。如果分区是唯一的,则$S$是{ \em唯一可避免的。}对于任意无理数$α>1$,Chow和Long构造了一个划分,它避开了所有可转化为$α$的分子,并证明了这个划分避开的集合$S_α$是唯一可避开的.我们证明了收敛的分子集是唯一可避免的当且仅当$α$的连分数有无穷多个等于1的部分收敛。我们还构造了集合$S_α$,并证明了它总是唯一可避免的。

英文摘要:

A partition of the positive integers into sets $A$ and $B$ {\em avoids} a set $S\subset\N$ if no two distinct elements in the same part have a sum in $S$. If the partition is unique, $S$ is {\em uniquely avoidable.} For any irrational $α>1$, Chow and Long constructed a partition which avoids the numerators of all convergents to $α$, and conjectured that the set $S_α$ which this partition avoided was uniquely avoidable. We prove that the set of numerators of convergents is uniquely avoidable if and only if the continued fraction for $α$ has infinitely many partial quotients equal to 1. We also construct the set $S_α$ and show that it is always uniquely avoidable.

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