Combining Philosophers
Ideas for E.M. Cioran, Jonathan Schaffer and GE Hughes/M Cresswell
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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 / 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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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / d. System T
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T adds □p→p for reflexivity, and is ideal for modeling lawhood [Schaffer,J]
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