Languages generated by P systems with active membranes

  • Authors:
  • Francesco Bernardini;Marian Gheorghe

  • Affiliations:
  • Department of Computer Science, The University of Sheffield, Regent Court, Portobello Street, Sheffield, S1 4DP, UK;Department of Computer Science, The University of Sheffield, Regent Court, Portobello Street, Sheffield, S1 4DP, UK

  • Venue:
  • New Generation Computing - Membrane computing
  • Year:
  • 2004

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Abstract

We propose an alternative approach to generate languages by means of P systems: building up an appropriate representation for a string by means of a corresponding membrane structure and then generating the string by visiting the membrane structure according to a well-specified strategy. To this aim, we consider P systems with active membranes, allowing membrane creation or division or duplication and dissolution, where the output of a computation may be obtained either by visiting the tree associated with the membrane structure, or by following the traces of a specific object, called traveller, or sending out the objects. For each of these approaches, we provide characterizations of reeursively enumerable languages based on P systems that use different sets of operations for modifying the membrane structure.