author = {Evelina ~Lamma AND Paola ~Mello AND Michela ~Milano AND Fabrizio
  title = {Integrating Induction and Abduction in Logic
  journal = {Information Sciences},
  pages = {25--54},
  volume = {116},
  number = {1},
  year = 1999,
  month = may,
  abstract = {We propose an approach for the integration of abduction and induction in
Logic Programming. We define an Abductive Learning Problem as an
extended Inductive Logic Programming problem where both the
background and target theories are abductive theories and where
abductive derivability is used as the coverage relation instead
of deductive derivability. The two main benefits of this
integration are the possibility of learning in presence of
incomplete knowledge and the increased expressive power of the
background and target theories.  We present the system LAP
(Learning Abductive Programs) that is able to solve this extended
learning problem and we describe, by means of examples, four
different learning tasks that can be performed by the system:
learning from incomplete knowledge, learning rules with
exceptions, learning from integrity constraints and learning
recursive predicates.},
  keywords = {Abduction, Negation, Integrity Constraints},
  publisher = {Elsevier Science},
  address = {Amsterdam, \TheNetherlands},
  pdf = {http://ds.ing.unife.it/~friguzzi/Papers/LamMelMil-IS99.pdf},
  doi = {10.1016/S0020-0255(98)10092-0},
  url = {http://www.sciencedirect.com/science/article/pii/S0020025598100920},
  copyright = {Elsevier}
  author = {Michela Milano and Andrea Omicini and Fabrizio Riguzzi},
  title = {Adopting an Object-Oriented Data Model in Inductive Logic Programming},
  booktitle = {Proceedings of the 12th International FLAIRS Conference (FLAIRS99),  3--5 May 1999, Orlando, Florida, USA},
  editor = {Amruth N. Kumar and Ingrid Russell},
  publisher = {{AAAI}},
  address = {Menlo Park, California},
  year = 1999,
  month = may,
  pages = {273--279},
  keywords = {Knowledge Representation},
  pdf = {http://ds.ing.unife.it/~friguzzi/Papers/MilOmRig-FLAIRS99.pdf}
  author = {Evelina Lamma and Fabrizio Riguzzi and Lu\'{i}s Moniz Pereira},
  title = {Learning Three-valued Logic Programs},
  booktitle = {Late Breaking Paper, 9th International Workshop on Inductive Logic Programming
  year = 1999,
  editor = {S. Dzeroski and P. Flach},
  month = jun,
  address = {Bled, \Slovenia},
  pdf = {http://ds.ing.unife.it/~friguzzi/Papers/LamRigPer-ILP99.pdf}
  author = {Evelina Lamma and Fabrizio Riguzzi and Lu\'{i}s Moniz Pereira},
  title = {Agents Learning in a Three-Valued Logical Setting},
  booktitle = {Workshop on Machine Learning and Intelligent Agents
   Advanced Course on Artificial Intelligence 1999 (ACAI'99)},
  year = 1999,
  address = {Crete, \Greece},
  month = jul,
  pdf = {http://ds.ing.unife.it/~friguzzi/Papers/LamRigPer-ACAI99.pdf}
  editor = {Giorgio Casadei and Fabrizio Riguzzi and Lorenza Saitta},
  title = {Atti del Workshop su Intelligenza Artificiale e Didattica, Sesto
    Congresso dell'Associazione Italiana per l'Intelligenza Artificiale (AI*IA99)},
  year = {1999},
  month = jul,
  publisher = {University of Bologna},
  address = {Bologna, \Italy},
  pages = {67}

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