Combining Philosophers
Ideas for Herodotus, Jonathan D. Jacobs and Ian McFetridge
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19 ideas
10. Modality / A. Necessity / 6. Logical Necessity
12184
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Logical necessity overrules all other necessities [McFetridge]
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15083
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The fundamental case of logical necessity is the valid conclusion of an inference [McFetridge, by Hale]
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15084
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In the McFetridge view, logical necessity means a consequent must be true if the antecedent is [McFetridge, by Hale]
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12180
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Logical necessity requires that a valid argument be necessary [McFetridge]
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12181
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Traditionally, logical necessity is the strongest, and entails any other necessities [McFetridge]
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12183
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It is only logical necessity if there is absolutely no sense in which it could be false [McFetridge]
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12192
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The mark of logical necessity is deduction from any suppositions whatever [McFetridge]
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10. Modality / A. Necessity / 10. Impossibility
14377
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Possibilities are manifestations of some power, and impossibilies rest on no powers [Jacobs]
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10. Modality / B. Possibility / 1. Possibility
14376
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States of affairs are only possible if some substance could initiate a causal chain to get there [Jacobs]
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10. Modality / B. Possibility / 2. Epistemic possibility
12182
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We assert epistemic possibility without commitment to logical possibility [McFetridge]
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10. Modality / B. Possibility / 9. Counterfactuals
14379
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Counterfactuals invite us to consider the powers picked out by the antecedent [Jacobs]
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10. Modality / C. Sources of Modality / 1. Sources of Necessity
12187
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Objectual modal realists believe in possible worlds; non-objectual ones rest it on the actual world [McFetridge]
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14372
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Possible worlds are just not suitable truthmakers for modality [Jacobs]
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10. Modality / C. Sources of Modality / 5. Modality from Actuality
12186
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Modal realists hold that necessities and possibilities are part of the totality of facts [McFetridge]
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12466
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All modality is in the properties and relations of the actual world [Jacobs]
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10. Modality / C. Sources of Modality / 6. Necessity from Essence
14371
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We can base counterfactuals on powers, not possible worlds, and hence define necessity [Jacobs]
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10. Modality / E. Possible worlds / 1. Possible Worlds / c. Possible worlds realism
12465
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Concrete worlds, unlike fictions, at least offer evidence of how the actual world could be [Jacobs]
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10. Modality / E. Possible worlds / 1. Possible Worlds / e. Against possible worlds
12464
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If some book described a possibe life for you, that isn't what makes such a life possible [Jacobs]
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12469
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Possible worlds semantics gives little insight into modality [Jacobs]
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