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On Insertion Grammars with Maximum Parallel Derivation

Dinu L.P.

Fundamenta Informaticae

2009

Vol. 93, nr 4

357-369

In this paper we investigate insertion grammars and explore their capacity to generate words parallelly by introducing parallel derivation (where more than one rule can be applied to the string in parallel) and maximum parallel derivation (where as many rules as possible are applied to the string in parallel). We compare the generative power of these grammars with context sensitive and context free grammars and with different variants of contextual grammars. We apply these grammars to syllabification in Romanian and provide arguments that they can also be used in a cognitive perspective.

Parallelism in contextual grammars

Mitrana V.

Fundamenta Informaticae

1998

Vol. 33, nr 3

281-294

Two strategies of parallel adjoining of contexts are considered for contextual grammars with choice. After a short comparison between them, there are provided Chomsky-Schutzenberger type characterizations of context-free and recursively enumerable languages. Finally, we discuss some decision problems.