Systems of Parallel Grammars

This article defines cooperating distributed grammar systems with E0L components instead of context-free grammars and discusses its generative power mainly in respect to ET0L systems. It recapitulates results about CD GS, then defines modified systems and shows that this combination has in most derivative modes equal strength to ET0L, except for terminating mode, which is shown to be more powerful. There are also explained examples of this new kind of systems