Deciding Unambiguity and Sequentiality of Polynomially Ambiguous Min-Plus Automata

Daniel Kirsten & Sylvain Lombardy
This paper solves the unambiguity and the sequentiality problem for polynomially ambiguous min-plus automata. This result is proved through a decidable algebraic characterization involving so-called metatransitions and an application of results from the structure theory of finite semigroups. It is noteworthy that the equivalence problem is known to be undecidable for polynomially ambiguous automata.
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