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                      First Call for Provers
                            CoCo 2018
                    7th Confluence Competition

                 the week of July 7-12, 2018
                       Oxford, United Kingdom
              http://coco.nue.ie.niigata-u.ac.jp/2018/
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Confluence provides a general notion of determinism and has been
conceived as one of the central properties of rewriting. Confluence
had been investigated in several formalisms of rewriting such as
first-order rewriting, lambda-calculi, higher-order rewriting,
constrained rewriting and conditional rewriting.  In recent years the
focus in confluence research has shifted towards the development of
automatable techniques for confluence proofs.  The confluence
competition aims to foster the development of techniques for
proving/disproving confluence automatically by setting up a dedicated
competition among confluence tools.

The 7th Confluence Competition (CoCo 2018) will run ***live*** during
the 3rd International Conference on Formal Structures for Computation
and Deduction (FSCD 2018), or the 7th International Workshop on
Confluence (IWC 2018) in Oxford, United Kingdom.

The following categories will be run:
* TRS:  confluence of first-order term rewrite systems
* CTRS: confluence of conditional term rewrite systems
* CPF:  certification
* HRS:  confluence of higher-order term rewrite systems
* GCR:  ground confluence of many-sorted term rewrite systems
* UN:   unique normal form properties of first-order term rewrite systems

Besides these categories, new categories will be considered if there
are tools and problems dedicated to those categories. We welcome
requests for categories. Demonstration categories are for demonstrating new
attempts and/or merits of particular tools.  Submissions of new
confluence problems are also welcome. For more information including
examples of new categories to be considered, platforms, competition
rules and problems, see the webpage of CoCo 2018 indicated above.

IMPORTANT DATES:
* request for competition categories    January 28, 2018
* request for demonstration categories  April 29, 2018
* tool registration                     June 14, 2018
* tool submission                       June 24, 2018
* problem submission                    June 28, 2018
* competition                           TBA (the week of July 7-12), 2018


REQUEST FOR NEW CATEGORIES:
Request for new categories is via the contact email address. Please send
the following information at your earliest convenience:
* category type (competition category or demonstration category)
* description of problems and semantics (rewrite steps, confluence, etc.)
  together with adequate references
* a proposal of the input format (if necessary) 
Requests for new categories may be rejected for technical reasons.

SUBMISSION OF NEW PROBLEMS:
Submissions of new confluence problems are welcome. Please use the web
interface of Cops (Confluence Problems) database linked from the
webpage of CoCo 2018.

REGISTRATION/SUBMISSION:
Tool registration is via the easychair. Every tool registration should
also contain a one page system description. Tool submission will be
via StarExec.

ORGANISING COMMITTEE:
* Takahito Aoto        Niigata University (chair)
* Nao Hirokawa         JAIST
* Julian Nagele        University of Innsbruck
* Naoki Nishida        Nagoya University

ADVISORY BOARD:
* Beniamino Accattoli  INRIA, Paris
* Yuki Chiba           DENSO Corporation

CONTACT:
 coco-sc [AT] jaist.ac.jp