Combining Philosophers
Ideas for Lynch,MP/Glasgow,JM, Bertrand Russell and Anselm
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10 ideas
10. Modality / A. Necessity / 2. Nature of Necessity
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'Necessary' is a predicate of a propositional function, saying it is true for all values of its argument [Russell]
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Modal terms are properties of propositional functions, not of propositions [Russell]
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10. Modality / A. Necessity / 6. Logical Necessity
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Some facts about experience feel like logical necessities [Russell]
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10. Modality / B. Possibility / 1. Possibility
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Only the actual exists, so possibilities always reduce to actuality after full analysis [Russell]
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10. Modality / B. Possibility / 5. Contingency
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Contingency arises from tensed verbs changing the propositions to which they refer [Russell]
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10. Modality / B. Possibility / 8. Conditionals / c. Truth-function conditionals
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Inferring q from p only needs p to be true, and 'not-p or q' to be true [Russell]
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All forms of implication are expressible as truth-functions [Russell]
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10. Modality / B. Possibility / 9. Counterfactuals
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It makes no sense to say that a true proposition could have been false [Russell]
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10. Modality / E. Possible worlds / 1. Possible Worlds / a. Possible worlds
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In any possible world we feel that two and two would be four [Russell]
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If something is true in all possible worlds then it is logically necessary [Russell]
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