Simulation by Rounds of Letter-to-Letter Transducers
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Letter-to-letter transducers are a standard formalism for modeling reactive systems. Often, two transducers that model similar systems differ locally from one another, by behaving similarly, up to permutations of the input and output letters within "rounds". In this work, we introduce and study notions of simulation by rounds and equivalence by rounds of transducers. In our setting, words are partitioned to consecutive subwords of a fixed length k, called rounds. Then, a transducer 𝒯_1 is k-round simulated by transducer 𝒯_2 if, intuitively, for every input word x, we can permute the letters within each round in x, such that the output of 𝒯_2 on the permuted word is itself a permutation of the output of 𝒯_1 on x. Finally, two transducers are k-round equivalent if they simulate each other. We solve two main decision problems, namely whether 𝒯_2 k-round simulates 𝒯_1 (1) when k is given as input, and (2) for an existentially quantified k. We demonstrate the usefulness of the definitions by applying them to process symmetry: a setting in which a permutation in the identities of processes in a multi-process system naturally gives rise to two transducers, whose k-round equivalence corresponds to stability against such permutations.
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