Predicate Logic
An argument expressed with sentences in predicate logic is valid if and only if the conclusion is true in every interpretation in which all the premises are.
Decidability of Description Logics with Transitive Closure of RolesThis paper investigates Description Logics which al- low transitive closure of roles to occur not only in con- cept inclusion axioms but also in role ... IN112 Mathematical LogicValidity of an argument can be defined: in model theory: is the conclusion true when premises are? in proof theory: does the argument respect some rules? classical determinate truth i - University of OxfordThe validity of the argument depends on the assumption that a disjunction is true if one of its disjuncts is true, as stated by Ockham in the second quote above ...
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