Ackermann encoding, bisimulations and OBDDs

  • Authors:
  • Carla Piazza;Alberto Policriti

  • Affiliations:
  • Dipartimento di Informatica, Università Ca' Foscari di Venezia, Via Torino, 155 – 30172 Mestre (VE), Italy (e-mail: piazza@dsi.unive.it);Dipartimento di Matematica e Informatica, Università di Udine, Via Le Scienze, 206 – 33100 Udine, Italy (e-mail: policriti@dimi.uniud.it)

  • Venue:
  • Theory and Practice of Logic Programming
  • Year:
  • 2004

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Abstract

We propose an alternative way to represent graphs via OBDDs based on the observation that a partition of the graph nodes allows sharing among the employed OBDDs. In the second part of the paper we present a method to compute at the same time the quotient w.r.t. the maximum bisimulation and the OBDD representation of a given graph. The proposed computation is based on an OBDD-rewriting of the notion of Ackermann encoding of hereditarily finite sets into natural numbers.