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'fragments/reports', 'Psychophysical and theoretical identifications' and 'Potentiality'
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / c. System D
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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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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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The Barcan formula endorses either merely possible things, or makes the unactualised impossible [Vetter]
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