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Abstract : The Ambient Logic (AL) has been proposed for expressing properties of process mobility in the calculus of Mobile Ambients (MA), and as a basis for query languages on semistructured data. We study some basic questions concerning the discriminating power of AL, focusing on the equivalence on processes induced by the logic (=L). As underlying calculi besides MA we consider a subcalculus in which an image-finiteness condition holds and that we prove to be Turing complete. Synchronous variants of these calculi are studied as well. In these calculi, we provide two operational characterisations of =L: a coinductive one (as a form of bisimilarity) and an inductive one (based on structual properties of processes). After showing =L to be stricly finer than barbed congruence, we establish axiomatisations of =L on the subcalculus of MA (both the asynchronous and the synchronous version), enabling us to relate =L to structural congruence. We also present some (un)decidability results that are related to the above separation properties for AL: the undecidability of =L on MA and its decidability on the subcalculus.
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Contributor : Etienne Lozes <>
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Daniel Hirschkoff, Etienne Lozes, Davide Sangiorgi. SEPARABILITY IN THE AMBIENT LOGIC. Logical Methods in Computer Science, Logical Methods in Computer Science Association, 2008, 4, pp.1 - 44. ⟨10.2168/LMCS-4⟩. ⟨hal-01905180⟩



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