Abstract
In this paper we give several improved universality results for two important classes of P systems: P systems with catalysts and evolution-communication P systems. First, the result from Reference,14) stating that six catalysts ensure the universality, has been improved in two ways: using bistable catalysts and using moving catalysts. Specifically, the universality can be reached with one bistable catalyst and 2 usual catalysts (using five membranes), as well as with one moving catalyst and three membranes, or with two moving catalysts and only two membranes. The second part of the paper deals with evolution-communication P systems, and we also give improved universality results for this type of systems, in terms of the weight of symport/antiport rules, number of membranes, or number of catalysts.
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Shankara Narayanan Krishna: She is an Assistant Professor in Dept. Computer Science & Engg, IIT Bombay, India. Her research interests are Natural Computing and Formal Methods.
Andrei Paun, Ph.D.: He obtained his bachelor degree in Mathematics and Computer Science from the University of Bucharest, Romania. He obtaind his Ph.D. degree in Computer Science, at University of Western Ontario, Canada, under the supervision of Prof. Dr. Sheng Yu, with the thesis “Unconventional Models of Computation: DNA and Membrane Computing”. After graduation he received a postdoctoral felloship from NSERC, Canada and after six months he accepted an assistant professor position in US at Louisiana Tech University.
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Krishna, S.N., Pâun, A. Results on catalytic and evolution-communication P systems. New Gener Comput 22, 377–394 (2004). https://doi.org/10.1007/BF03037288
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DOI: https://doi.org/10.1007/BF03037288