FO^2 with one transitive relation is decidable
FO^2 with one transitive relation is decidable
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具有一个传递关系的 FO^2 是可判定的
DOI:
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
Lidia Tendera
中科院分区:
文献类型:
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作者:
W. Szwast;Lidia Tendera
We show that the satisfiability problem for the two-variable first-order logic, FO^2, over transitive structures when only one relation is required to be transitive, is decidable. The result is optimal, as FO^2 over structures with two transitive relations, or with one transitive and one equivalence relation, are known to be undecidable, so in fact, our result completes the classification of FO^2-logics over transitive structures with respect to decidability.
We show that the satisfiability problem is in 2-NExpTime.
Decidability of the finite satisfiability problem remains open.