A recurrent enumeration of free hypermultisets

  • Authors:

  • Vincenzo Manca

  • Affiliations:

  • Department of Computer Science, University of Verona, Italy

  • Venue:
  • Computation, cooperation, and life
  • Year:
  • 2011

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Abstract

A recurrent formula enumerating unlabeled membrane structures is presented, which is deduced by means of elementary combinatorial arguments by considering them as hypermultisets built from the empty set.