Combining Texts
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'The Evolution of Logic', 'An Introduction to Modal Logic' and 'Evidence'
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4 ideas
4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / b. Terminology of PL
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A 'value-assignment' (V) is when to each variable in the set V assigns either the value 1 or the value 0 [Hughes/Cresswell]
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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / c. Derivation rules of PL
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Conditional Proof: infer a conditional, if the consequent can be deduced from the antecedent [Hart,WD]
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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / d. Basic theorems of PL
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The Law of Transposition says (P→Q) → (¬Q→¬P) [Hughes/Cresswell]
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4. Formal Logic / B. Propositional Logic PL / 4. Soundness of PL
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The rules preserve validity from the axioms, so no thesis negates any other thesis [Hughes/Cresswell]
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