[TYPES] CADE-20 workshop on Disoproving

Wolfgang Ahrendt ahrendt at cs.chalmers.se
Fri Feb 25 14:29:56 EST 2005

CADE-20 Workshop on

Non-Theorems, Non-Validity, Non-Provability

Tallinn, Estonia
Friday, July 22, 2005

Call for Papers


for a web version of this CFP, see:



Automated Reasoning (AR) traditionally has focused on proving
theorems. Because of this, AR methods and tools in the past were
mostly applied to formulae which were already known to be true. If on
the other hand a formula is not a theorem, then most traditional AR
methods and tools cannot handle this properly (i.e. they will fail,
run out of resources, or simply not terminate).
The opposite of proving, which we call disproving, particularly
aims at identifying non-theorems, i.e. showing non-validity
resp. non-provability, and providing some kind of proof of
non-validity (non-provability). The proof for example could be a
counter model, or an instantiation making the formula false.


In the scope of the workshop is every method that is able to discover
non-theorems and, ideally, provides explanation why the formula is not a
theorem. Possible subjects are decision procedures, model generation
methods, reduction to SAT, formula simplification methods, abstraction
based methods, failed-proof analysis.

Topics of relevance to the workshop therefore include

   * disproving conjectures in general,
   * extending standard proving methods with disproving capabilities,
   * approximative methods for identifying non-theorems,
   * counterexample generation,
   * counter model generation,
   * finite model generation,
   * decision procedures,
   * failure analysis,
   * reparation of non-theorems,
   * heuristics that help in identifying non-theorems,
   * applications and system descriptions.

Workshop Goal

The disproving workshops are intended as a platform for the exchange
of ideas between researchers concerned with disproving in the broad
sense. By discussing approaches across the different AR
sub-communities, the workshop can identify common problems and
solutions. Another goal is to elaborate known, and discover unknown,
connections between other areas and disproving. Also, the meeting can
enable an exchange of interesting examples for non-theorems. A long
term goal is that the workshop series contributes to forming a
disproving community within AR, and gives the work on disproving a
greater visibility.


Non-theorems are an issue wherever one tries to prove statements which
are not known to be valid in advance. Therefore, we aim at researchers
from all areas of automated reasoning. The issue of the workshop is
particularly relevant for all logics, calculi, and proving paradigms
where non-validity is not covered by the (plain versions of) standard
methods. This includes (but is not restricted to) first-order logic
proving, inductive theorem proving, rewriting based reasoning,
higher-order logic proving, logical frameworks, and special purpose
logics like for instance program logics. We also target at the model
generation community.

Beside mature work, we also solicit preliminary work or work in
progress to be presented.

Technical Programme

The technical program will include presentations of the accepted
papers, discussions about the state and future of the field, and an
invited talk.

Invited Speakers

   * Byron Cook, Microsoft Research, Cambridge (shared speaker with ESCAR)

   * Juergen Giesl, RWTH Aachen

Programme Committee

   * Wolfgang Ahrendt (Organizer)
   * Peter Baumgartner (Organizer)
   * Johan Bos
   * Chris Fermueller
   * Uli Furbach
   * Bernhard Gramlich
   * Bill McCune
   * Hans de Nivelle (Organizer)
   * Renate Schmidt
   * Carsten Schuermann
   * Graham Steel
   * Cesare Tinelli
   * Andrei Voronkov
   * Calogero Zarba


Submissions should not exceed 10 pages. The submission procedure will
be electronical only, and only PDF files are acceptable. Details will
be announced in due time on the workshop web page.

The deadline for submission is 1st of May 2005.


The final versions of the selected contributions will be collected in
a volume to be distributed at the workshop and accessible on the web.

The organisers plan for a
special issue of the Nordic Journal of Computing,
based on extended versions of selected workshop papers, but
open to non-participants, in all cases with fresh reviewing. The
decision of whether to do so will be taken after the workshop. (The
according post proceedings of last years workshop are soon to appear
within ENTCS.)

Workshop Venue

The workshop will be held on Friday, 22 July, as part of CADE-20
(20th International Conference on Automated Deduction)
Tallinn, Estonia, 22 July - 27 July, 2005.

Workshop Organizers

     Wolfgang Ahrendt
     Chalmers University of Technology, Gothenburgh, Sweden
     Email: ahrendt at cs.chalmers.se

     Peter Baumgartner
     MPI fuer Informatik, Saarbruecken, Germany
     Email: baumgart at mpi-sb.mpg.de

     Hans de Nivelle
     MPI fuer Informatik, Saarbruecken, Germany
     Email: nivelle at mpi-sb.mpg.de

Important Dates

     May   1:  Paper submissions deadline
     June  1:  Notification of acceptance
     June 26:  Final versions due
     Friday, 22 July: new workshop date


   * Workshop web page: www.cs.chalmers.se/~ahrendt/cade20-ws-disproving/
   * CADE-20 home page: http://deepthought.ttu.ee/it/cade/

For further information on the workshop, please contact any of the

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