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The authors introduce the Hybrid Automata Stochastic Logic (HASL), a new temporal logic formalism for the verification of Discrete Event Stochastic Processes (DESP). HASL employs Linear Hybrid Automata (LHA) as machineries to select prefixes of relevant execution paths of a DESP. The advantage with LHA is that rather elaborate information can be collected on-the-fly during path selection, providing the user with a powerful means to express sophisticated measures. A formula of HASL consists of an LHA and an expression Z referring to moments of path random variables.
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