Combining Texts
Ideas for
'fragments/reports', 'Philosophical Logic' and 'On Freedom'
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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 / 5. Contingency
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5040
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Necessary truths can be analysed into original truths; contingent truths are infinitely analysable [Leibniz]
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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 / D. Knowledge of Modality / 2. A Priori Contingent
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13159
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Only God sees contingent truths a priori [Leibniz]
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10. Modality / E. Possible worlds / 3. Transworld Objects / e. Possible Objects
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5039
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If non-existents are possible, their existence would replace what now exists, which cannot therefore be necessary [Leibniz]
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