Unary negation fragment with equivalence relations has the finite model property [article]

Daniel Danielski, Emanuel Kieronski
2018 arXiv   pre-print
We consider an extension of the unary negation fragment of first-order logic in which arbitrarily many binary symbols may be required to be interpreted as equivalence relations. We show that this extension has the finite model property. More specifically, we show that every satisfiable formula has a model of at most doubly exponential size. We argue that the satisfiability (= finite satisfiability) problem for this logic is TwoExpTime-complete. We also transfer our results to a restricted
more » ... t of the guarded negation fragment with equivalence relations.
arXiv:1802.01318v2 fatcat:3nf73w32abh45dnm5zvcgrfe34