Combining Philosophers
Ideas for Hermarchus, Andrew Dobson and John P. Burgess
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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]
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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]
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