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arXiv 0710.1234math.CO
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共轭的Hamming距离

Hamming Distance for Conjugates

Jeffrey Shallit

摘要:

设x,y是等长的字符串。x和y之间的汉明距离h(x,y)是x和y不同的位置的数量。如果x是y的循环移位,我们说x和y是共轭的。我们考虑f(x,y),共轭xy和yx之间的汉明距离。在一个二进制字母表上,f(x,y)总是偶数,并且必须满足另一个技术条件。相比之下,在一个长度为3或更大的字母表上,f(x,y)可以取0到|x| + |y|之间的任何值,除了1;此外,我们总是可以假设较小的字符串只有一种类型的字母。

英文摘要:

Let x, y be strings of equal length. The Hamming distance h(x,y) between x and y is the number of positions in which x and y differ. If x is a cyclic shift of y, we say x and y are conjugates. We consider f(x,y), the Hamming distance between the conjugates xy and yx. Over a binary alphabet f(x,y) is always even, and must satisfy a further technical condition. By contrast, over an alphabet of size 3 or greater, f(x,y) can take any value between 0 and |x|+|y|, except 1; furthermore, we can always assume that the smaller string has only one type of letter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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