https://www.dagstuhl.de/19062

February 3 – 6 , 2019, Dagstuhl Seminar 19062

Bringing CP, SAT and SMT together: Next Challenges in Constraint Solving

Organizers

Sébastien Bardin (CEA LIST, FR)
Nikolaj S. Bjorner (Microsoft Research – Redmond, US)
Cristian Cadar (Imperial College London, GB)
Vijay Ganesh (University of Waterloo, CA)

For support, please contact

Dagstuhl Service Team for administrative matters

Shida Kunz for scientific matters

Documents

List of Participants
Shared Documents

Motivation

Constraint solving is at the heart of several key technologies, including program analysis, testing, formal methods, compilers, security analysis, optimization, and AI. During the last two decades, constraint solving has been highly successful and transformative: on the one hand, SAT/SMT solvers have seen a significant performance improvement with a concomitant impact on software engineering, formal methods and security; on the other hand, CP solvers have also seen a dramatic performance improvement, with deep impact in AI and optimization.

These successes bring new applications and new challenges, not yet met by current technologies, e.g.:

  • some fundamental constraints still lack efficient reasoning (e.g., floating-point arithmetic);
  • quantifiers are rarely taken into account - especially with model generation;
  • current approaches focus essentially on satisfiability and/or validity, while some applications would benefit from queries such as optimization or model counting.

While each of the SAT, SMT and CP communities has made progress on some aspects of these problems, no approach is able to tackle them all, and their combination is already a challenge. Moreover, while historically strongly connected, the SAT/SMT community and the CP community have had minimal interactions over the recent years.

The aim of this seminar is to reunify the Constraint Solving landscape and contribute at shaping it for the next decade, through identifying the next big challenges together with promising approaches. The seminar will bring together researchers from SAT, SMT and CP along with applications researchers in order to foster cross-fertilization of ideas, deepen interactions and identify the best ways to serve the application fields.

Especially, we expect strong interactions during the seminar around the following points:

  • [CP] advance propagation, domain-dedicated reasoning and (deep) constraint combination;
  • [SAT] branching heuristics, look-ahead, and conflict-clause learning methods;
  • [SMT] theory solvers and well-defined solver combinations;
  • How can we better serve the needs of applications researchers?
  • Finally, an important question is how to leverage machine learning in these contexts. The experience of the SAT community may bring here some answers.

License
  Creative Commons BY 3.0 DE
  Sébastien Bardin, Nikolaj S. Bjorner, Cristian Cadar, and Vijay Ganesh

Related Dagstuhl Seminar

Classification

  • Security / Cryptology
  • Software Engineering
  • Verification / Logic

Keywords

  • Automated Decision Procedures
  • Constraint Programming
  • SAT/SMT

Book exhibition

Books from the participants of the current Seminar 

Book exhibition in the library, ground floor, during the seminar week.

Documentation

In the series Dagstuhl Reports each Dagstuhl Seminar and Dagstuhl Perspectives Workshop is documented. The seminar organizers, in cooperation with the collector, prepare a report that includes contributions from the participants' talks together with a summary of the seminar.

 

Download overview leaflet (PDF).

Publications

Furthermore, a comprehensive peer-reviewed collection of research papers can be published in the series Dagstuhl Follow-Ups.

Dagstuhl's Impact

Please inform us when a publication was published as a result from your seminar. These publications are listed in the category Dagstuhl's Impact and are presented on a special shelf on the ground floor of the library.

NSF young researcher support