======================================================================                    WST 2026 - First Call for Papers               21st International Workshop on Termination https://termination-portal.org/wiki/21st_International_Workshop_on_Terminati...

July 25, 2026, Lisbon, Portugal

Affiliated with IJCAR, July 26-29, 2026 ======================================================================

The Workshop on Termination (WST) traditionally brings together, in an informal   setting,  researchers   interested   in   all aspects  of termination,  whether  this  interest  be  practical  or theoretical, primary  or  derived.   The  workshop   also  provides  a ground for cross-fertilization of ideas from the different communities interested in termination (e.g., working on computational mechanisms, programming languages,  software  engineering,   constraint  solving, etc.). The friendly  atmosphere  enables  fruitful  exchanges  leading  to joint research and subsequent publications.

The workshop is held as part of the 2026 Federated Logic Conference (FLoC 2026 https://www.floc26.org) and is affiliated with the 13th International Joint Conference on Automated Reasoning (IJCAR 2026 https://www.floc26.org/ijcar).

IMPORTANT DATES

- title and abstract submission: April 28, 2026 - submission: May 5, 2026 - notification: May 26, 2026 - early registration:  June 1, 2026 - final version: June 26, 2026 - workshop: July 25, 2026

TOPICS

The 21st International Workshop on Termination  welcomes contributions on all aspects of  termination.  In particular,  papers investigating applications  of  termination  (for example  in  complexity analysis, program  analysis  and   transformation,   theorem  proving,  program correctness,  modeling  computational systems, etc.) are very welcome.

Topics of interest include (but are not limited to):

- termination and complexity analysis in any domain (lambda    calculus, declarative programming, rewriting, transition systems,    probabilistic programs, etc.)  - abstraction methods in termination analysis  - certification of termination and complexity proofs  - challenging termination problems  - comparison and classification of termination methods  - implementation of termination and complexity methods  - non-termination analysis  - normalization and infinitary normalization  - operational termination of logic-based systems  - ordinal notation and subrecursive hierarchies  - SAT, SMT, and constraint solving for (non-)termination analysis  - scalability and modularity of termination methods  - well-founded relations and well-quasi-orders

SUBMISSION GUIDELINES

Submissions  are  short  papers/extended abstracts  which should not exceed 5 pages.  There will be no formal reviewing.  In particular, we welcome  short  versions  of  recently  published articles and papers submitted  elsewhere.  The  program  committee  checks relevance and provides additional feedback for each submission.  The accepted papers will be made available electronically before the workshop.

Papers should be submitted electronically through the HotCRP system at:

https://submissions.floc26.org/wst/

Please use  LaTeX and the LIPIcs style file from

https://github.com/dagstuhl-publishing/styles/

to prepare your submission.

PROGRAM COMMITTEE

- Florian Frohn, RWTH Aachen University (co-chair)  - Raúl Gutiérrez, Universitat Politècnica de València  - Dieter Hofbauer, ASW Saarland  - Nils Lommen, RWTH Aachen University  - Johannes Niederhauser, University of Innsbruck  - Vincent van Oostrom, University of Sussex  - Étienne Payet, Université de La Réunion (co-chair)  - Hiroshi Unno, Tohoku University  - Wim Vanhoof, Université de Namur  - Dragana Milovancevic, Imperial College London

TERMINATION COMPETITION

Since 2003, the effect of WST to stimulate new research on termination has been enhanced by the Termination Competition

https://termination-portal.org/wiki/Termination_Competition

and its continuously developing Problem Databases containing thousands of  programs  as  challenges  for  termination  analysis in different categories.  In 2026, the Termination Competition will run during WST.

CONTACT

- Florian Frohn: florian._surname_(at)informatik.rwth-aachen.de - Étienne Payet: etienne._surname_(at)univ-reunion.fr