The Elements of Formal Logic by G.E. Hughes Paperback Book
41,66 €
Preface 1. Establishing Validity (Theory) 4. Establishing Validity (Practice) 5. Disjunction and Disjunctive Inference 6. Material Equivalence: 'If and Only If' 7. Valid Inference and Proof 8. The Propositional Calculus 9.
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