In propositional logic, a propositional formula is a type of syntactic formula which is well formed and has a truth value. If the values of all variables...

The propositional calculus is a branch of logic. It is also called propositional logic, statement logic, sentential calculus, sentential logic, or sometimes...

mathematical logic, propositional logic and predicate logic, a well-formed formula, abbreviated WFF or wff, often simply formula, is a finite sequence...

tautology of propositional logic, and uniformly replacing each propositional variable by a first-order formula (one formula per propositional variable)....

function. Propositional variables are the basic building-blocks of propositional formulas, used in propositional logic and higher-order logics. Formulas in logic...

nested within an OR In classical logic each propositional formula can be converted to an equivalent formula that is in CNF. This transformation is based...

needed] In relation to the mind, propositions are discussed primarily as they fit into propositional attitudes. Propositional attitudes are simply attitudes...

logic, an atomic formula (also known as an atom or a prime formula) is a formula with no deeper propositional structure, that is, a formula that contains...

calculus. This is similar to a way of axiomatizing classical propositional logic. In propositional logic, the inference rule is modus ponens MP: from ϕ → ψ...

constant. Connectives can be used to connect logical formulas. For instance in the syntax of propositional logic, the binary connective ∨ {\displaystyle \lor...