# Home

The SMArT project is funded by the call ANR-DFG Programmes blancs 2013, a program of the French Agence Nationale de la Recherche (ANR) and the (German) Deutsche Forschungsgemeinschaft (DFG).

The objective of the SMArT project is to provide advanced techniques for arithmetic reasoning for formal system verification. During the last decade, there has been tremendous progress on symbolic verification techniques, spurred in particular by the development of SMT (satisfiability modulo theories) techniques and tools. SMT solvers are core engines that are successfully used for program verification, bounded and parameterized model checking, test generation, etc. They combine a SAT solver for deciding satisfiability of propositional logic with theory reasoners for deciding satisfiability of sets of literals over interpreted symbols, and instantiation techniques for handling quantifiers.

Reasoning in various fragments of arithmetic is a fundamental and ubiquitous requirement in verification. Today's SMT solvers are mostly limited to quantifier-free formulas over linear arithmetic (i.e., formulas involving only constants, +, and <), for which efficient decision procedures exist over both integer and real numbers. This fragment is sufficient for ensuring certain properties such as the absence of out-of-bound array accesses in simple heap-manipulating programs. Nevertheless, the linear fragment represents a severe restriction on expressiveness, and ideas have started to emerge on the support for stronger arithmetic fragments within SMT solvers.

We propose to adapt known efficient techniques and algorithms to handle rich arithmetic fragments and for which mature solvers exist, so that they can be used within an SMT context. The advantages of such a combination are: (1) the arithmetic solver no longer needs to handle propositional operators, (2) the SMT solver gets access to a sophisticated infrastructure (data structures and algorithms) for handling much more expressive arithmetic fragments, (3) users benefit from the modular architecture of SMT solvers where arithmetic can be combined with other relevant theories.

## News

[30/09/17] The project reached its end of life. If you were interested by the SMArT project, you might want to check the SC² project.

[29/07/17] The second SC² workshop (organized within the SC² CSA project) takes place in Kaiserslautern on Saturday July 29th, 2017.

[08/05/17] We are preparing the wrapping up of the SMArT project with the "SMArT week". All members are in Nancy, and we are happy to host Marek Kosta for the week.

[19/04/17] Vijay Ganesh is visiting SMArT. He is giving a talk at 14:00 on April 20th, in room A006: On The Unreasonable Effectiveness of Boolean SAT Solvers.

[03/12/16] Marek Kosta will defend his thesis in Saarbrücken. The title is: New Concepts for Real Quantifier Elimination by Virtual Substitution.

[01/12/16] Haniel Barbosa, close collaborator of the project, is joining the project for 10 month.

[04/10/16] Martin Brain is in Nancy for discussing SMArT. He is giving a talk at 14:00, room A006: Bit-Exact Automated Reasoning About Floating-Point Arithmetic.

[24/09/16] The first SC² workshop (organized within the SC² CSA project by Erika Abraham and Pascal Fontaine) takes place in Timisoara on Saturday September 24th, 2016.

[02/08/16] Thomas Sturm is giving an invited talk at ACA 2016: Real Problems over the Reals: From Complete Elimination Procedures to Subtropical Decisions.

[28/04/16] SMArT is happy to host Prof. James Harold Davenport, from the University of Bath, U.K. He is giving a talk on Friday, April 29th, at 14:00 in room C103 in the Loria Building: The Complexity of Cylindrical Algebraic Decomposition.

[29/03/16] Pascal Fontaine is giving a talk at the Journée “solveurs SMT dans le contexte des systèmes embarqués critiques”

[28/02/16] The SC-square Coordination and Support Action is accepted by the EU (H2020-FETOPN-2015-CSA_712689). The project aims to bridge the communities of Satisfiability Checking and Symbolic Computation to solve real problems. All members of the ANR-DFG SMArT are either investigators or partners of SC², and the SMArT project has been instrumental in triggering SC-square. Check out also the community web page.

[15/01/16] A new version (1.3.0) of the SMT plugin for Rodin is available on sourceforge.

[01/01/16] Thomas Sturm is joining the VeriDiS team in Nancy as a CNRS Director of Research.

Michael Sagraloff takes over as the ANR-DFG coordinator in Saarbrücken.

[01/01/16] Maximilian Joroschek is joining Vienna (TU Wien). Maximilian has been a postdoc funded by SMArT for 18 months.

[01/01/16] David Deharbe, external collaborator (Prof. at DIMAp, UFRN, Natal, Brazil) is joining ClearSy.

[03/12/15-04/12/15] Martin Bromberger is coming at Loria to discuss Satisfiability Modulo Arithmetic Theories (SMArT).

[15/11/15-20/11/15] The German and French coordinators of SMArT (Pascal Fontaine and Thomas Sturm) are organizing, with Erika Abraham and Dongming Wang, a Dagstuhl seminar on Symbolic Computation and Satisfiability Checking.

[16/10/15] The SMArT project is meeting the ANR in Paris for half-time evaluation.

[21/09/15] A prototype version of veriT running with Redlog is available here. The software has been tested on the QF_NRA category of the SMT-LIB and results are promising. You might experience some difficulties to compile though. We are working hard to improve performance, expressiveness, and the compilation procedure. Stay tuned!

[20/09/15] Thomas Sturm is giving an invited talk at FroCoS 2015: From Complete Elimination Procedures to Subtropical Decisions over the Reals.

[26/01/15] P. Fontaine and T. Sturm (coordinators of this project) are co-organizing (with Erika Abraham and Dongming Wang) a Dagstuhl seminar in Nov. 2015 on Symbolic Computation and Satisfiability Checking.

[13/11/14] Fifth meeting: the JAIST-Loria Workshop 2014 on SMT

[01/09/14] Pablo Federico Dobal is becoming a PhD Student in Nancy in the project

[04/08/14] The SMArT Summer School will take place at MPI from August 04 to August 08.

[01/07/14] Maximilian Jaroschek is joining MPI as a PostDoc in the project

[13/06/14] The next meeting is planned in Vienna on July 17-18 2014, in the Vienna Summer of Logic

[12/06/14] Second meeting

[06/05/14] Kick-off meeting

[01/12/13] Haniel Barbosa is joining the team in Nancy as a PhD Student

[21/10/13] The ANR-DFG project SMArT has been accepted