Generating all minimal integral solutions to AND-OR systems of monotone inequalities: Conjunctions are simpler than disjunctions

  • Authors:
  • Leonid Khachiyan;Endre Boros;Khaled Elbassioni;Vladimir Gurvich

  • Affiliations:
  • -;RUTCOR, Rutgers University, 640 Bartholomew Road, Piscataway, NJ 08854-8003, USA;Max-Planck-Institut für Informatik, 66123 Saarbrücken, Germany;RUTCOR, Rutgers University, 640 Bartholomew Road, Piscataway, NJ 08854-8003, USA

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2008

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Abstract

We consider monotone @?,@?-formulae @f of m atoms, each of which is a monotone inequality of the form f"i(x)=t"i over the integers, where for i=1,...,m, f"i:Z^n@?R is a given monotone function and t"i is a given threshold. We show that if the @?-degree of @f is bounded by a constant, then for linear, transversal and polymatroid monotone inequalities all minimal integer vectors satisfying @f can be generated in incremental quasi-polynomial time. In contrast, the enumeration problem for the disjunction of m inequalities is NP-hard when m is part of the input. We also discuss some applications of the above results in disjunctive programming, data mining, matroid and reliability theory.