Combining Texts
Ideas for
'fragments/reports', 'Philosophical Logic' and 'Logical Properties'
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7 ideas
10. Modality / A. Necessity / 4. De re / De dicto modality
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15420
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De re modality seems to apply to objects a concept intended for sentences [Burgess]
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10. Modality / A. Necessity / 6. Logical Necessity
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15419
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General consensus is S5 for logical modality of validity, and S4 for proof [Burgess]
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15417
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Logical necessity has two sides - validity and demonstrability - which coincide in classical logic [Burgess]
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10. Modality / B. Possibility / 8. Conditionals / a. Conditionals
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15422
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Three conditionals theories: Materialism (material conditional), Idealism (true=assertable), Nihilism (no truth) [Burgess]
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15423
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It is doubtful whether the negation of a conditional has any clear meaning [Burgess]
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10. Modality / C. Sources of Modality / 5. Modality from Actuality
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6080
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Modality is not objects or properties, but the type of binding of objects to properties [McGinn]
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10. Modality / E. Possible worlds / 1. Possible Worlds / b. Impossible worlds
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6079
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If 'possible' is explained as quantification across worlds, there must be possible worlds [McGinn]
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