On the Size Complexity of Non-Returning Context-Free PC Grammar Systems

@inproceedings{CsuhajVarj2009OnTS,
  title={On the Size Complexity of Non-Returning Context-Free PC Grammar Systems},
  author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Gy{\"o}rgy Vaszil},
  booktitle={DCFS},
  year={2009}
}
Improving the previously known best bound, we show that any recursively enumerable language can be generated with a non-returning parallel communicating (PC) grammar system having six contextfree components. We also present a non-returning universal PC grammar system generating unary languages, that is, a system where not only the number of components, but also the number of productions and the number of nonterminals are limited by certain constants, and these size parameters do not depend on… 
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