Combining Texts
Ideas for
'Concerning the Author', 'The Metaphysics of Modality' and 'Rationality and Logic'
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14 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 / 4. De re / De dicto modality
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12003
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De re modal formulae, unlike de dicto, are sensitive to transworld identities [Forbes,G]
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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 / 4. Necessity from Concepts
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12028
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De re necessity is a form of conceptual necessity, just as de dicto necessity is [Forbes,G]
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10. Modality / E. Possible worlds / 1. Possible Worlds / c. Possible worlds realism
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12008
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Unlike places and times, we cannot separate possible worlds from what is true at them [Forbes,G]
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12009
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The problem with possible worlds realism is epistemological; we can't know properties of possible objects [Forbes,G]
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10. Modality / E. Possible worlds / 2. Nature of Possible Worlds / a. Nature of possible worlds
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12007
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Possible worlds are points of logical space, rather like other times than our own [Forbes,G]
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10. Modality / E. Possible worlds / 3. Transworld Objects / a. Transworld identity
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12011
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Transworld identity concerns the limits of possibility for ordinary things [Forbes,G]
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12016
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The problem of transworld identity can be solved by individual essences [Forbes,G]
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10. Modality / E. Possible worlds / 3. Transworld Objects / c. Counterparts
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12004
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Counterpart theory is not good at handling the logic of identity [Forbes,G]
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10. Modality / E. Possible worlds / 3. Transworld Objects / d. Haecceitism
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12021
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Haecceitism attributes to each individual a primitive identity or thisness [Forbes,G]
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12029
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We believe in thisnesses, because we reject bizarre possibilities as not being about that individual [Forbes,G]
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