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14th International Workshop on Termination (WST)


The Workshop on Termination 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-fertilisation of ideas from term rewriting and from the different programming language communities. The friendly atmosphere enables fruitful exchanges leading to joint research and subsequent publications.

The 14th International Workshop on Termination in Vienna continues the successful workshops held in St. Andrews (1993), La Bresse (1995), Ede (1997), Dagstuhl (1999), Utrecht (2001), Valencia (2003), Aachen (2004), Seattle (2006), Paris (2007), Leipzig (2009), Edinburgh (2010), Obergurgl (2012), and Bertinoro (2013). More information on earlier WSTs is available on the Termination Portal:



The 14th International Workshop on Termination welcomes contributions on all aspects of termination and complexity analysis (and their automation) for various models of computation, ranging from rewrite systems and state transition systems to programming languages.

Contributions from the imperative, constraint, functional, logic, and concurrent programming communities, and papers investigating applications of complexity or termination (for example in program transformation or theorem proving) are particularly welcome.

Areas of interest include, but are not limited to, the following:

  • Termination of programs
  • Termination of rewriting
  • Termination analysis of transition systems
  • Complexity of programs
  • Complexity of rewriting
  • Implicit computational complexity
  • Implementation of termination and complexity analysis methods
  • SAT and SMT solving for (non-)termination analysis
  • Certification of termination and complexity proofs
  • Termination orders, well-founded orders, and reduction orders
  • Termination methods for theorem provers
  • Strong and weak normalisation of lambda calculi
  • Termination analysis for different language paradigms
  • Invariants for termination proving
  • Challenging termination problems
  • Applications to program transformation and compilation
  • Comparison and classification of termination methods
  • Non-termination and loop detection
  • Termination in distributed and concurrent systems
  • Proof methods for liveness and fairness
  • Well-quasi-order theory
  • Ordinal notations and subrecursive hierarchies


Program Committee

Invited Talk

The keynote will be given by Jasmin Fisher, Microsoft Research and Department of Biochemistry, University of Cambridge, United Kingdom:



Termination of Biological Programs


Living cells are highly complex reactive systems operating under varying environmental conditions. By executing diverse cellular programs, cells are driven to acquire distinct cell fates and behaviours. Deciphering these programs is key to understanding how cells orchestrate their functions to create robust systems in health and disease. Due to the staggering complexity, this remains a major challenge. Stability in biological systems is a measure of the homeostatic nature and robustness against environmental perturbations. In computer science, stability means that the system will eventually reach a fixed point regardless of its initial state. Or, in other words, that all computations terminate with variables acquiring the same value regardless of the path that led to termination. Based on robust techniques to prove stabilization/termination in very large systems, we have developed an innovative platform called BMA that allows biologists to model and analyse biological signalling networks. BMA analyses systems for stabilization, searches for paths leading to stabilization, and allows for bounded model-checking and simulation, all with intelligible visualization of results. In this talk, I will summarize our efforts in this direction and talk about the application of termination analysis in drug discovery and cancer.

Joint work with Byron Cook, Nir Piterman, Samin Ishtiaq, Alex Taylor and Ben Hall.

Informal Proceedings

The informal proceedings of WST 2014 are available here: pdf

Accepted Papers

Call for Papers

Call for Papers


Carsten Fuhs