Complexity, Expressibility, and Decidability in Automated Reasoning

Affiliated with IJCAR 2008 Sydney, Australia, 10-15 August 2008

Invited speakers

  • Carsten Lutz (TU Dresden)
  • Alessandro Armando (U. Genova)
  • Program


    CEDAR proceedings


    Program and Workshop Chairs

  • Franz Baader (TU Dresden)
  • Silvio Ghilardi (U. Milano)
  • Miki Hermann (Ecole Polytechnique, Palaiseau)
  • Ulrike Sattler (U. Manchester)
  • Viorica Sofronie-Stokkermans (MPI, Saarbrücken)
  • Program Committee

  • Carlos Areces (INRIA Nancy)
  • Franz Baader (TU Dresden)
  • Matthias Baaz (T.U.Wien)
  • Maria Paola Bonacina (U. Verona)
  • Sebastian Brandt (U. Manchester)
  • Christian Fermüller (T.U.Wien)
  • Silvio Ghilardi (U. Milano)
  • Reiner Haehnle (Chalmers U.)
  • Miki Hermann (Ecole Polytechnique, Palaiseau)
  • Felix Klaedtke (ETH Zurich)
  • Sava Krstic (Intel Corporation)
  • Christopher Lynch (Clarkson U.)
  • Bijan Parsia (U. Manchester)
  • Silvio Ranise (LORIA/INRIA-Lorraine)
  • Ulrike Sattler (U. Manchester)
  • Renate Schmidt (U. Manchester)
  • Viorica Sofronie-Stokkermans (MPI,Saarbrücken)
  • Lidia Tendera (U. Opole)
  • Ashish Tiwari (SRI International)
  • Luca Vigano (U. Verona)
  • Frank Wolter (U. Liverpool)
  • Call for papers


    Submission procedure


    Important Dates

  • 2 June 2008: Paper submission (extended)
  • 23 June 2008: Notification
  • 7 July 2008: Final version
  • 10 August 2008: Workshop
  • Contact

    For further informations please send an e-mail to Viorica Sofronie-Stokkermans

    Decidability, and especially complexity and tractability of logical theories is extremely important for a large number of applications. Although general logical formalisms (such as predicate logic or number theory) are undecidable, decidable theories or decidable fragments thereof (sometimes even with low complexity) often occur in mathematics, in program verification, in the verification of reactive, real time or hybrid systems, as well as in databases and ontologies. It is therefore important to identify such decidable fragments and design efficient decision procedures for them. It is equally important to have uniform methods (such as resolution, rewriting, tableaux, sequent calculi, ...) which can be tuned to provide algorithms with optimal complexity.

    The goal of CEDAR is to bring together researchers interested in problems that are in the interface between automated reasoning and computational complexity, in particular in:

  • identifying (fragments of) logical theories which are decidable, identifying fragments thereof which have low complexity, and analyzing possibilities of obtaining optimal complexity results with uniform tools;
  • analyzing decidability in combinations of theories and possibilities of combining decision procedures;
  • efficient implementations for decidable fragments;
  • application domains where decidability resp. tractability are crucial.

  • Topics

    Topics of interest for CEDAR 2008 include (but are not restricted to):
  • Complexity:
  • complexity analysis for fragments of first- (or higher) order logic
  • complexity analysis for combinations of logical theories
    (including parameterized complexity results)
  • Expressibility (in logic, automated reasoning, algebra, ...)
  • Decidability:
  • decision procedures based on logical calculi such as:
    resolution, rewriting, tableaux, sequent calculi, or natural deduction
  • decidability in combinations of logical theories
  • Application domains for which complexity issues are essential
    (verification, security, databases, ontologies, ...)
  • The goal of CEDAR is to bring together researchers interested in exploring the topics above, both at a theoretical level and motivated by applications, and to enhance the interaction between automated reasoning and computational complexity through invited and contributed talks.

    The ultimate aim is to expand the horizons of this area of research, deepen the interactions, sensibilize other people from the automated reasoning community to the complexity problems, and last but not least, offer persons working in research and development centers of software companies the possibility to get an overview of the problems.

    Submission and selection procedure:

    We plan to accept three types of papers:
  • Original papers (up to 15 pages, LNCS style, including bibliography); should describe original research and contain sufficient detail to assess the merits and relevance of the contribution. Simultaneous submission of material is prohibited.

  • Work in progress (up to 6 pages, LNCS style, without bibliography).

  • Presentation-only papers (please submit an abstract of up to 3 pages, LNCS style + a link to the already published paper): may describe work previously published. The abstracts of accepted presentation-only papers will appear in the informal proceedings to be distributed at the workshop (full papers in this category will not be inserted in the proceedings).
    We are allowing the submission of previously published work in order to allow researchers to communicate good ideas that the attendees may not be aware of.

  • Given the informal style of the workshop, the submission of papers presenting student's work and work in progress is encouraged.
    Submission of papers is via Easychair


    The final versions of the selected contributions will be collected in a volume to be distributed at the workshop. These informal proceedings will also be made accessible on the web.

    A special journal issue is planned.