Zeroth-order logic
From Infogalactic: the planetary knowledge core
Zeroth-order logic is first-order logic without variables or quantifiers. Some authors use the phrase "zeroth-order logic" as a synonym for the propositional calculus,[1] but an alternative definition extends propositional logic by adding constants, operations, and relations on non-Boolean values.[2] Every zeroth-order theory in this broader sense is complete and compact.[2]
