Combining Texts
Ideas for
'Thinking About Mathematics', 'Philosophical Logic' and 'A Powers Theory of Modality'
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14 ideas
10. Modality / A. Necessity / 4. De re / De dicto modality
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
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 / A. Necessity / 10. Impossibility
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Possibilities are manifestations of some power, and impossibilies rest on no powers [Jacobs]
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10. Modality / B. Possibility / 1. Possibility
14376
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States of affairs are only possible if some substance could initiate a causal chain to get there [Jacobs]
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10. Modality / B. Possibility / 8. Conditionals / a. Conditionals
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 / B. Possibility / 9. Counterfactuals
14379
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Counterfactuals invite us to consider the powers picked out by the antecedent [Jacobs]
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10. Modality / C. Sources of Modality / 1. Sources of Necessity
14372
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Possible worlds are just not suitable truthmakers for modality [Jacobs]
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10. Modality / C. Sources of Modality / 5. Modality from Actuality
12466
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All modality is in the properties and relations of the actual world [Jacobs]
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10. Modality / C. Sources of Modality / 6. Necessity from Essence
14371
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We can base counterfactuals on powers, not possible worlds, and hence define necessity [Jacobs]
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10. Modality / E. Possible worlds / 1. Possible Worlds / c. Possible worlds realism
12465
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Concrete worlds, unlike fictions, at least offer evidence of how the actual world could be [Jacobs]
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10. Modality / E. Possible worlds / 1. Possible Worlds / e. Against possible worlds
12464
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If some book described a possibe life for you, that isn't what makes such a life possible [Jacobs]
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12469
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Possible worlds semantics gives little insight into modality [Jacobs]
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