[TYPES/announce] CoCo 2017: Second Call for Provers

[Nao Hirokawa]

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                       Second Call for Provers
                             CoCo 2017
                     6th Confluence Competition

              September 8th 2017, Oxford, United Kingdom
               http://coco.nue.riec.tohoku.ac.jp/2017/
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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 6th Confluence Competition (CoCo 2017) will run ***live*** during
the 6th International Workshop on Confluence (IWC 2017), to be collocated
with the 2nd International Conference on Formal Structures for
Computation and Deduction in Oxford, United Kingdom.

The following categories will be run.  GCR and UN are new categories.
* 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 2017 indicated above.

IMPORTANT DATES:
* request for competition categories    February 28, 2017 (closed)
* request for demonstration categories  June 30, 2017
* tool registration                     August 13, 2017
* tool submission                       August 23, 2017
* problem submission                    August 27, 2017
* competition                           September 8, 2017

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 2017.

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           JAIST

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