14th International Workshop on Confluence
2-3 September, 2025, Leipzig
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IWC 2025
Background Invited Speakers Important Dates Submission Program Committee Steering Committee Previous IWCs Contact

IWC 2025

14th International Workshop on Confluence

2nd - 3rd September, 2025, Leipzig, Germany

Co-located with WST 2025

News

Background

Confluence provides a general notion of determinism and has been conceived as one of the central properties of rewriting systems. Confluence relates to many topics of rewriting (completion, modularity, termination, commutation, etc.) and has been investigated in many formalisms of rewriting, such as first-order rewriting, lambda-calculi, higher-order rewriting, constraint rewriting, conditional rewriting, and so on. Recently there is a renewed interest in confluence research, resulting in new techniques, tool support, confluence competition, and certification as well as in new applications. The scope of the workshop is all these aspects of confluence and related topics.

The goal of the workshop is to provide a forum for researchers interested in the topic of confluence to exchange and share new developments in the field. The workshop will enable discussion on theoretical results, new problems, applications, implementations and benchmarks, and share the current state-of-the-art on the development of confluence tools.

Topics are thus:

The 14th Confluence Competition CoCo 2025 will run live during IWC 2025.

Invited Speaker

Salvador Lucas, Universitat Politècnica de València
Confluence of Conditional Rewriting Modulo

Sets of equations E play an important computational role in rewriting-based systems R by defining an equivalence relation =E inducing a partition of terms into E-equivalence classes on which rewriting computations, denoted →R/E and called rewriting modulo E, are issued. This paper investigates confluence of →R/E, usually called E-confluence, for conditional rewriting-based systems, where rewriting steps are determined by conditional rules. We rely on Jouannaud and Kirchner's framework to investigate confluence of an abstract relation R modulo an abstract equivalence relation E on a set A. We show how to particularize the framework to be used with conditional systems. Then, we show how to define appropriate finite sets of conditional pairs to prove and disprove E-confluence. Our results apply to well-known classes of rewriting-based systems. In particular, to Equational (Conditional) Term Rewriting Systems.

Important Dates

submission (abstract): 1st June, 2025 8th June, 2025 (extended!)
submission (paper): 1st June, 2025 8th June, 2025 11th June, 2025 (extended again!)
notification: 30th June, 2025 7th July, 2025
early registration: 23rd July, 2025 new!
final version: 31st July, 2025
workshop: 2nd-3rd September 2025

(deadlines are AoE)

Submission

We solicit short papers or extended abstracts of at most five pages excluding references. 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 may provide additional feedback. The accepted papers will be made available electronically before the workshop.

The page limit for papers is 5 pages (excluding references, but 6 pages in total) in EasyChair style (6 pages excluding references, but 7 pages in total in the final version). Submission is electronically through

https://easychair.org/conferences/?conf=iwc2025

Program Committee

Previous IWCs

Contact