Combining Texts
Ideas for
'fragments/reports', 'Modal Logics and Philosophy' and 'The Prince'
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6 ideas
4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4
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7794
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There are seven modalities in S4, each with its negation [Girle]
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
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7793
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◊p → □◊p is the hallmark of S5 [Girle]
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7795
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S5 has just six modalities, and all strings can be reduced to those [Girle]
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4. Formal Logic / D. Modal Logic ML / 4. Alethic Modal Logic
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7787
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Possible worlds logics use true-in-a-world rather than true [Girle]
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7788
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Modal logic has four basic modal negation equivalences [Girle]
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7796
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Modal logics were studied in terms of axioms, but now possible worlds semantics is added [Girle]
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