On the number of occurrences of a symbol in words of regular languages
β Scribed by Alberto Bertoni; Christian Choffrut; Massimiliano Goldwurm; Violetta Lonati
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 351 KB
- Volume
- 302
- Category
- Article
- ISSN
- 0304-3975
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
Then the entropy decreases strictly: ent(L W ) Β‘ ent(L). In this note we present a new proof of this fact, based on a method of Gromov, which avoids the Perron-Frobenius theory. This result applies to the regular languages of ΓΏnitely generated free groups and an additional application is presented.
We consider slender languages, that is, languages for which the number of words of the same length is bounded from above by a constant. It is known that the slender context-free languages are precisely the unions of paired loops, that is, ΓΏnite unions of sets of the form {uv n wx n y | nΒΏ0}. Analysi
In the paper we address the consistency problem for drawn symbolic picture grammars. In particular we prove that it is always possible to decide whether or not a regular grammar generates only consistent descriptions of drawn symbolic pictures.
Let S be the set of all palindromes over B \*. It is well known. that the language S\* is an ultralinear, inherently ambiguous context-free language. In this paper we derive an explicit expression for the number of words of length n in S2. Furthermore, we show, that for card(P)> 1 the asymptotical d