Construction of an explicit basis for rules admissible in modal system S4

Rybakov, VV2024-07-182024-07-1820010942-5616https://doi.org/10.1002/1521-3870(200111)47:4<441https://hdl.handle.net/11411/6923We find an explicit basis for all admissible rules of the modal logic S4. Our basis consists of an infinite sequence of rules which have compact and simple, readable form and depend on increasing set of variables. This gives a basis for all quasi-identities valid in the free modal algebra F-S4(omega) of countable rank.eninfo:eu-repo/semantics/closedAccessİnference RuleModal LogicFree AlgebraKripke ModelBasis For Admissible RulesAdmissible RuleIntuitionistic LogicConstruction of an explicit basis for rules admissible in modal system S4Article2-s2.0-003554119610.1002/1521-3870(200111)47:4<4414464Q244147Q4WOS:000172160800002