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arXiv · 2509.18518

Refined Barrier Conditions for Finite-Time Safety and Reach-Avoid Guarantees in Stochastic Systems

Bai Xue·Luke Ong·Dominik Wagner·Peixin Wang
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Abstract

Providing finite-time probabilistic safety and reach-avoid guarantees is crucial for safety-critical stochastic systems. Existing state-of-the-art barrier methods often rely on a restrictive boundedness assumption for auxiliary functions, limiting their applicability. This paper presents refined barrier conditions that remove this assumption. Specifically, we establish conditions for deriving upper bounds on finite-time safety probabilities in discrete-time systems and lower bounds on finite-time reach-avoid probabilities in continuous-time systems. This relaxation expands the class of verifiable systems, especially those with unbounded state spaces, and facilitates the use of advanced optimization techniques, such as semi-definite programming with polynomial functions. Numerical examples demonstrate the effectiveness of the approach.

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Bai Xue, Luke Ong, Dominik Wagner, Peixin Wang. 2025-09-23. Refined Barrier Conditions for Finite-Time Safety and Reach-Avoid Guarantees in Stochastic Systems. https://arxiv.org/abs/2509.18518

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