二元无立方词中的二元模式:可避免性和增长
Binary Patterns in Binary Cube-Free Words: Avoidability and Growth
摘要:
研究了二元无立方词对二元模式的可避性,得到了可避模式与不可避模式的精确界,并证明了所有可避模式都是DL-可避的.对于可避免模式,避免语言的增长率进行了研究。所有这些语言,除了无符号的语言,被证明有指数增长。避免最小可避免模式的语言的准确增长率通过计算机辅助上界近似。最后给出了一个新的多项式增长模式回避语言的例子。
英文摘要:
The avoidability of binary patterns by binary cube-free words is investigated and the exact bound between unavoidable and avoidable patterns is found. All avoidable patterns are shown to be D0L-avoidable. For avoidable patterns, the growth rates of the avoiding languages are studied. All such languages, except for the overlap-free language, are proved to have exponential growth. The exact growth rates of languages avoiding minimal avoidable patterns are approximated through computer-assisted upper bounds. Finally, a new example of a pattern-avoiding language of polynomial growth is given.
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