Combining Texts
Ideas for
'Law and Causality', 'Philosophical Logic' and 'The Doctrine of Necessity Examined'
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8 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 / 7. Chance
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14804
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Is chance just unknown laws? But the laws operate the same, whatever chance occurs [Peirce]
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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 / B. Possibility / 8. Conditionals / d. Non-truthfunction conditionals
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10993
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Ramsey's Test: believe the consequent if you believe the antecedent [Ramsey, by Read]
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10. Modality / B. Possibility / 8. Conditionals / e. Supposition conditionals
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14279
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Asking 'If p, will q?' when p is uncertain, then first add p hypothetically to your knowledge [Ramsey]
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