Ideas from 'Could There Be Unicorns?' by Michael Dummett [1983], by Theme Structure
[found in 'The Seas of Language' by Dummett,Michael [OUP 1993,0-19-823621-2]].
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4. Formal Logic / D. Modal Logic ML / 1. Modal Logic
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16951
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It was realised that possible worlds covered all modal logics, if they had a structure
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic
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16953
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Relative possibility one way may be impossible coming back, so it isn't symmetrical
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16952
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If something is only possible relative to another possibility, the possibility relation is not transitive
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / d. System T
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16960
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If possibilitiy is relative, that might make accessibility non-transitive, and T the correct system
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4
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16958
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In S4 the actual world has a special place
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10. Modality / E. Possible worlds / 1. Possible Worlds / a. Possible worlds
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16957
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Possible worlds aren't how the world might be, but how a world might be, given some possibility
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10. Modality / E. Possible worlds / 1. Possible Worlds / c. Possible worlds realism
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16959
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If possible worlds have no structure (S5) they are equal, and it is hard to deny them reality
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23. Ethics / C. Virtue Theory / 1. Virtue Theory / d. Virtue theory critique
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16956
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To explain generosity in a person, you must understand a generous action
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26. Natural Theory / B. Natural Kinds / 7. Critique of Kinds
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16954
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Generalised talk of 'natural kinds' is unfortunate, as they vary too much
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