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Behavioural Pseudometrics for Nondeterministic Probabilistic Systems

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Book cover Dependable Software Engineering: Theories, Tools, and Applications (SETTA 2016)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 9984))

Abstract

For the model of probabilistic labelled transition systems that allow for the co-existence of nondeterminism and probabilities, we present two notions of bisimulation metrics: one is state-based and the other is distribution-based. We provide a sound and complete modal characterisation for each of them, using real-valued modal logics based on Hennessy-Milner logic. The logic for characterising the state-based metric is much simpler than an earlier logic by Desharnais et al. as it uses only two non-expansive operators rather than the general class of non-expansive operators. For the kernels of the two metrics, which correspond to two notions of bisimilarity, we give a comprehensive comparison with some typical distribution-based bisimilarities in the literature.

Y. Deng—Partially supported by the National Natural Science Foundation of China (61672229, 61261130589), Shanghai Municipal Natural Science Foundation (16ZR1409100), and ANR 12IS02001 PACE.

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Notes

  1. 1.

    Notice that we do not claim that negation and testing operators, plus some constant functions, suffice to represent all the non-expansive operators on the unit interval. That claim is too strong to be true. For example, the operator \(f(x)=\frac{1}{2}x\) cannot be represented by those operators.

  2. 2.

    Since we will compare our logic with that in [17], it is better for our semantic interpretation to be consistent with that in the aforementioned work. In the literature, there are also other ways of interpreting conjunction and disjunction in probabilistic settings, see e.g. [3, 29].

  3. 3.

    Although \(\mathbf {d}_{ d}\) can measure the distance between two subdistributions, the Kantorovich lifting of \(\mathbf {d}_{ s }\) can only measure the distance between full distributions or subdistributions of equal mass, which can easily be normalized to full distributions.

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Acknowledgement

We thank the anonymous referees for their helpful comments.

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Correspondence to Yuxin Deng .

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Du, W., Deng, Y., Gebler, D. (2016). Behavioural Pseudometrics for Nondeterministic Probabilistic Systems. In: Fränzle, M., Kapur, D., Zhan, N. (eds) Dependable Software Engineering: Theories, Tools, and Applications. SETTA 2016. Lecture Notes in Computer Science(), vol 9984. Springer, Cham. https://doi.org/10.1007/978-3-319-47677-3_5

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