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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL

4632	'Natural' systems of deduction are based on normal rational practice, rather than on axioms [Baggini /Fosl]

4631	In ideal circumstances, an axiom should be such that no rational agent could possibly object to its use [Baggini /Fosl]