Combining Texts
Ideas for
'Writing the Book of the World', 'Rationality and Logic' and 'On 'Generation and Corruption''
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10 ideas
10. Modality / A. Necessity / 2. Nature of Necessity
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11083
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A sentence is necessary if it is true in a set of worlds, and nonfalse in the other worlds [Hanna]
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10. Modality / A. Necessity / 5. Metaphysical Necessity
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11086
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Metaphysical necessity can be 'weak' (same as logical) and 'strong' (based on essences) [Hanna]
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10. Modality / A. Necessity / 6. Logical Necessity
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11084
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Logical necessity is truth in all logically possible worlds, because of laws and concepts [Hanna]
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10. Modality / A. Necessity / 7. Natural Necessity
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11085
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Nomological necessity is truth in all logically possible worlds with our laws [Hanna]
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10. Modality / C. Sources of Modality / 1. Sources of Necessity
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15030
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Humeans say that we decide what is necessary [Sider]
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15031
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Modal terms in English are entirely contextual, with no modality outside the language [Sider]
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10. Modality / C. Sources of Modality / 3. Necessity by Convention
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15027
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If truths are necessary 'by convention', that seems to make them contingent [Sider]
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15028
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Conventionalism doesn't seem to apply to examples of the necessary a posteriori [Sider]
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10. Modality / C. Sources of Modality / 4. Necessity from Concepts
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15033
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Humeans says mathematics and logic are necessary because that is how our concept of necessity works [Sider]
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10. Modality / C. Sources of Modality / 5. Modality from Actuality
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15025
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The world does not contain necessity and possibility - merely how things are [Sider]
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