On the Size of P Systems with Minimal Symport/Antiport

@inproceedings{Vaszil2004OnTS,
  title={On the Size of P Systems with Minimal Symport/Antiport},
  author={Gy{\"o}rgy Vaszil},
  booktitle={Workshop on Membrane Computing},
  year={2004}
}
We show that P systems with symport/antiport rules sending at most one object per direction generate any recursively enumerable set of natural numbers with three membranes. This improves the previously known best bound of four membranes. 
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