Combining Philosophers
Ideas for Anaxarchus, Barbara Vetter and Oliver,A/Smiley,T
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8 ideas
4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / c. System D
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19033
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Deontic modalities are 'ought-to-be', for sentences, and 'ought-to-do' for predicates [Vetter]
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
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19032
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S5 is undesirable, as it prevents necessities from having contingent grounds [Vetter]
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
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19036
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The Barcan formula endorses either merely possible things, or makes the unactualised impossible [Vetter]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
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14239
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The empty set is usually derived from Separation, but it also seems to need Infinity [Oliver/Smiley]
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14240
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The empty set is something, not nothing! [Oliver/Smiley]
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14241
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We don't need the empty set to express non-existence, as there are other ways to do that [Oliver/Smiley]
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14242
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Maybe we can treat the empty set symbol as just meaning an empty term [Oliver/Smiley]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / c. Unit (Singleton) Sets
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14243
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The unit set may be needed to express intersections that leave a single member [Oliver/Smiley]
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