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Implicit Semi-Algebraic Abstraction for Polynomial Dynamical Systems

Abstract : Semi-algebraic abstraction is an approach to the safety verification problem for polynomial dynamical systems where the state space is partitioned according to the sign of a set of polynomials. Similarly to predicate abstraction for discrete systems, the number of abstract states is exponential in the number of polynomials. Hence, semi-algebraic abstraction is expensive to explicitly compute and then analyze (e.g., to prove a safety property or extract invariants). In this paper, we propose an implicit encoding of the semi-algebraic abstraction, which avoids the explicit enumeration of the abstract states: the safety verification problem for dynamical systems is reduced to a corresponding problem for infinite-state transition systems, allowing us to reuse existing model-checking tools based on Satisfiability Modulo Theory (SMT). The main challenge we solve is to express the semi-algebraic abstraction as a first-order logic formula that is linear in the number of predicates, instead of exponential, thus letting the model checker lazily explore the exponential number of abstract states with symbolic techniques. We implemented the approach and validated experimentally its potential to prove safety for polynomial dynamical systems.
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https://hal.inria.fr/hal-03533919
Contributor : Sergio Mover Connect in order to contact the contributor
Submitted on : Wednesday, January 19, 2022 - 10:14:04 AM
Last modification on : Thursday, January 20, 2022 - 3:39:45 AM
Long-term archiving on: : Wednesday, April 20, 2022 - 6:15:47 PM

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Sergio Mover, Alessandro Cimatti, Alberto Griggio, Ahmed Irfan, Stefano Tonetta. Implicit Semi-Algebraic Abstraction for Polynomial Dynamical Systems. Computer Aided Verification, 12759, Springer International Publishing; Springer International Publishing, pp.529-551, 2021, Lecture Notes in Computer Science, ⟨10.1007/978-3-030-81685-8\_25⟩. ⟨hal-03533919⟩

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