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LFCS
2009
Springer
13 years 11 months ago
2009
Springer
In this paper we consider languages of labelled N-free posets over countable and scattered linear orderings. We prove that a language of such posets is series-rational if and only ...
CSR
2008
Springer
13 years 6 months ago
2008
Springer
We prove that every rational language of words indexed by linear orderings is definable in monadic second-order logic. We also show that the converse is true for the class of langu...