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A Kleene-Schützenberger Theorem for Trace Series over Bounded Lattices

Huschenbett M.

Fundamenta Informaticae

2011

Vol. 112, nr 2/3

171-191

We study weighted trace automata with weights in strong bimonoids. Traces form a generalization of words that allow to model concurrency; strong bimonoids are algebraic structures that can be regarded as "semirings without distributivity". A very important example for the latter are bounded lattices, especially non-distributive ones. We show that if both operations of the bimonoid are locally finite, then the classes of recognizable and mc-rational trace series coincide and, in general, are properly contained in the class of c-rational series. Moreover, if, in addition, in the bimonoid the addition is idempotent and the multiplication is commutative, then all three classes coincide.