Minimal witnesses for probabilistic timed automata
Abstract
Witnessing subsystems have proven to be a useful concept in the analysis of probabilistic systems, for example as diagnostic information on why a given property holds or as input to refinement algorithms. This paper introduces witnessing subsystems for reachability problems in probabilistic timed automata (PTA). Using a new operation on difference bounds matrices, it is shown how Farkas certificates of finite-state bisimulation quotients of a PTA can be translated into witnessing subsystems. We present algorithms for the computation of minimal witnessing subsystems under three notions of minimality, which capture the timed behavior from different perspectives, and discuss their complexity.
Keywords
Cite
@article{arxiv.2007.00637,
title = {Minimal witnesses for probabilistic timed automata},
author = {Simon Jantsch and Florian Funke and Christel Baier},
journal= {arXiv preprint arXiv:2007.00637},
year = {2020}
}
Comments
33 pages; conference version accepted for publication at ATVA'20