more from Keith Devlin

### Single Idea 8086

#### [catalogued under 4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL]

Full Idea

Since predicate logic merely extends propositional logic, all the axioms of propositional logic are axioms of predicate logic.

Gist of Idea

Predicate logic retains the axioms of propositional logic

Source

Keith Devlin (Goodbye Descartes [1997], Ch. 4)

Book Reference

Devlin,Keith: 'Goodbye Descartes: the end of logic' [Wiley 1997], p.83

A Reaction

See Idea 7798 for the axioms.

Related Idea

Idea 7798
There are three axiom schemas for propositional logic **[Girle]**