1 Basic notion -- 2 Validity -- 3 Formality -- 4 The symbols of propositional logic -- 5 The language L -- 6 Logical consequence in L -- 7 The system Sn -- 8 Derivability in Sn -- 9 The system Sa -- 10 Consistency, soundness, completeness -- 11 Quantification -- 12 The symbols o…
"3" Result
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