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Unexpected Universality Results for Three Classes of P Systems with Symport/Antiport

  • Mihai Ionescu
  • Carlos Martín-Vide
  • Andrei PĂun
  • Gheorghe PĂun
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2568)

Abstract

Symport and antiport are biological ways of transporting molecules through membranes in “collaborating” pairs; in the case of symport the two molecules pass in the same direction, in the case of antiport the two molecules pass in opposite directions. Here we first survey the results about the computing power of membrane systems (P systems) using only symport/antiport rules (hence these systems compute only by using communication), then we introduce a novel way of defining the result of a computation in a membrane system: looking for the trace of certain objects in their movement through membranes. Rather unexpected, in this way we get characterizations of recursively enumerable languages by means of membrane systems with symport/antiport which work with multisets of objects (note the qualitative difference between the data structure used by computations - multisets: no ordering - and the data structure of the output - strings: linear ordering). A similar remark holds true for the case of analysing P systems: the sequence of certain distinguished objects taken from the environment during a computation is the string recognized by the computation. We also survey universality results from this area, with sketched proofs.

Keywords

Membrane System Mathematical Linguistics Register Machine Membrane Computing Skin Membrane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Mihai Ionescu
    • 1
  • Carlos Martín-Vide
    • 2
  • Andrei PĂun
    • 3
  • Gheorghe PĂun
    • 2
    • 4
  1. 1.Faculty of MathematicsUniversity of BucharestBucuresştiRomania
  2. 2.Research Group on Mathematical LinguisticsRovira i Virgili UniversityTarragonaSpain
  3. 3.Department of Computer ScienceUniversity of Western Ontario LondonOntarioCanada
  4. 4.Institute of Mathematics of the Romanian AcademyBucuresştiRomania

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