Combining Philosophers

Ideas for H.Putnam/P.Oppenheim, St Mark and John P. Burgess

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2 ideas

4. Formal Logic / D. Modal Logic ML / 6. Temporal Logic

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With four tense operators, all complex tenses reduce to fourteen basic cases [Burgess]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

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The temporal Barcan formulas fix what exists, which seems absurd [Burgess]