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 of predicate logic.
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