Run supports and initial algebra supports of weighted automata

Manfred Droste; Heiko Vogler

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arXiv · 2409.08727

Run supports and initial algebra supports of weighted automata

Manfred Droste·Heiko Vogler

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Abstract

We consider weighted automata over words and over trees where the weight algebras are strong bimonoids, i.e., semirings which may lack distributivity. It is well known that, for each such weighted automaton, its run semantics and its initial algebra semantics can be different, due to the absence of distributivity. Here we investigate the question under which conditions on a zero-sum-free strong bimonoid the support of the run semantics equals the support of the initial algebra semantics. We prove a characterization of this equality both for weighted automata over words and for weighted automata over trees in terms of two weakened distributivity laws for the strong bimonoids which are required to hold only for expressions evaluating to zero. This provides a natural extension of two classical results on the coincidence of the run semantics and the initial algebra semantics. We also consider shortly the images of the two semantics functions.

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Manfred Droste, Heiko Vogler. 2024-09-13. Run supports and initial algebra supports of weighted automata. https://arxiv.org/abs/2409.08727

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