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Decidable Expansions of Labelled Linear Orderings (1102.2232v2)
Published 10 Feb 2011 in cs.LO and math.LO
Abstract: Consider a linear ordering equipped with a finite sequence of monadic predicates. If the ordering contains an interval of order type \omega or -\omega, and the monadic second-order theory of the combined structure is decidable, there exists a non-trivial expansion by a further monadic predicate that is still decidable.