A transformation of structures τ is monadic second-order compatible (MS-compatible) if every monadicsec ond-order property P can be effectively rewritten into a monadic second-order property Q such that, for every structure S, if T is the transformed structure τ (S), then P(T) holds iff Q(S) holds. We will review Monadic Second-order definable transductions (MS-transductions): they are MS-compatible transformations of a particular form, i.e., defined by monadicsec ond-order (MS) formulas. The unfolding of a directed graph into a tree is an MS-compatible transformation that is not an MS-transduction. The MS-compatibility of various transformations of semantical interest follows. We will present three main cases and discuss applications and open problems.
CITATION STYLE
Courcelle, B. (2002). Semantical evaluations as monadic second-order compatible structure transformations. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 2303, pp. 1–4). Springer Verlag. https://doi.org/10.1007/3-540-45931-6_1
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