On the number of occurrences of all short factors in almost all words |
| |
Authors: | Ioan Tomescu |
| |
Affiliation: | Faculty of Mathematics, University of Bucharest, Str. Academiei, 14, R-70109, Bucharest, Romania |
| |
Abstract: | We previously proved that almost all words of length n over a finite alphabet A with m letters contain as factors all words of length k(n) over A as n→∞, provided limsupn→∞ k(n)/log n<1/log m. In this note it is shown that if this condition holds, then the number of occurrences of any word of length k(n) as a factor into almost all words of length n is at least s(n), where limn→∞ log s(n)/log n=0. In particular, this number of occurrences is bounded below by C log n as n→∞, for any absolute constant C>0. |
| |
Keywords: | Word Factor Occurrence Random string |
本文献已被 ScienceDirect 等数据库收录! |
|