| Título: | The existential theory of equations with rational constraints in free groups is PSPACE-complete |
| Autores: |
Diekert, Volkert Gutiérrez, Claudio Hagenah, Christian |
| Fecha: |
2007-05-18 2007-05-18 2005-11-01 |
| Publicador: | ACADEMIC PRESS INC ELSEVIER SCIENCE |
| Fuente: |
Ver documento |
| Tipo: | Artículo de Revista |
| Tema: |
WORD EQUATIONS MAKANIN ALGORITHM GRAPH PRODUCTS |
| Descripción: | It is well-known that the existential theory of equations in free groups is decidable. This is a celebrated result of Makanin which was published 1982. Makanin did not discuss complexity issues, but later it was shown that the scheme of his algorithm is not primitive recursive. In this paper we present an algorithm that works in polynomial space. This improvement is based upon an extension of Plandowski's techniques for solving word equations. We present a Pspace-algorithm in a more general setting where each variable has a rational constraint, that is, the solution has to respect a specification given by a regular word language. We obtain our main result about the existential theory in free groups as a corollary of the corresponding statement in free monoids with involution. |
| Idioma: | Inglés |