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arXiv 1803.09009math.CO
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通过连接较小泛圈构造de Bruijn序列

Constructing de Bruijn sequences by concatenating smaller universal cycles

Daniel Gabric, Joe Sawada

摘要:

我们提出了充分条件时,不相交集$\mathbf{S}_1, \mathbf{S}_2, \ldots , \mathbf{S}_m$的通用循环$α_1, α_2, \ldots, α_m$的顺序可以连接在一起,以获得一个通用的循环$\mathbf{S} = \mathbf{S}_1 \cup \mathbf{S}_2 \cup \cdots \cup \mathbf{S}_m$。当$\mathbf{S}$是长度为$n$的所有$k$元字符串的集合时,这种成功构造的结果是de Bruijn序列。我们的条件适用于推广两个以前已知的de Bruijn序列的建设,然后他们被应用到开发三个新的de Bruijn序列的建设。

英文摘要:

We present sufficient conditions for when an ordering of universal cycles $α_1, α_2, \ldots, α_m$ for disjoint sets $\mathbf{S}_1, \mathbf{S}_2, \ldots , \mathbf{S}_m$ can be concatenated together to obtain a universal cycle for $\mathbf{S} = \mathbf{S}_1 \cup \mathbf{S}_2 \cup \cdots \cup \mathbf{S}_m$. When $\mathbf{S}$ is the set of all $k$-ary strings of length $n$, the result of such a successful construction is a de Bruijn sequence. Our conditions are applied to generalize two previously known de Bruijn sequence constructions and then they are applied to develop three new de Bruijn sequence constructions.

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