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Ideas for 'The Justification of Deduction', 'Thus Spake Zarathustra' and 'Intro: Theories of Vagueness'

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2 ideas

4. Formal Logic / B. Propositional Logic PL / 3. Truth Tables

19060

Truth-tables are dubious in some cases, and may be a bad way to explain connective meaning [Dummett]

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

9065	S5 collapses iterated modalities (◊□P→□P, and ◊◊P→◊P) [Keefe/Smith]