Context-free languages and pushdown automata
Handbook of formal languages, vol. 1
On monotonic automata with a restart operation
Journal of Automata, Languages and Combinatorics
Marcus Contextual Grammars
FCT '95 Proceedings of the 10th International Symposium on Fundamentals of Computation Theory
A grammar based approach to a grammar checking of free word order languages
COLING '94 Proceedings of the 15th conference on Computational linguistics - Volume 2
Deterministic Two-Way Restarting Automata and Marcus Contextual Grammars
Fundamenta Informaticae - Contagious Creativity - In Honor of the 80th Birthday of Professor Solomon Marcus
Degrees of non-monotonicity for restarting automata
Theoretical Computer Science
Restarting automata and their relations to the Chomsky hierarchy
DLT'03 Proceedings of the 7th international conference on Developments in language theory
Monotone deterministic RL-Automata don't need auxiliary symbols
DLT'05 Proceedings of the 9th international conference on Developments in Language Theory
Modeling syntax of free word-order languages: dependency analysis by reduction
TSD'05 Proceedings of the 8th international conference on Text, Speech and Dialogue
On the complexity of 2-monotone restarting automata
DLT'04 Proceedings of the 8th international conference on Developments in Language Theory
Hi-index | 5.23 |
The t-contextual grammars are generalizations of Marcus contextual grammars, which insert t contexts in each derivation step. If the selection mappings are regular and satisfy an additional locality restriction, then these grammars correspond in their expressive power to restarting automata with cut-index t. In the first part of the paper classes of languages are studied that are accepted by certain types of restarting automata with limited cut-index. As already R-automata with cut-index 1 accept NP-complete languages, additional restrictions in the form of certain monotonicity conditions are also considered. Without the locality restriction t-contextual grammars with regular selection correspond to t- RR-automata with cut-index one. These are RR-automata that are allowed to perform up to t deletion operations in each cycle that each delete a single factor only. In the second part of the paper the expressive power of these automata is studied, where the focus is on the special case that certain monotonicity conditions are satisfied.