Combining Philosophers

Ideas for Critias, Ion and Bertrand Russell

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10 ideas

10. Modality / A. Necessity / 2. Nature of Necessity
8375 'Necessary' is a predicate of a propositional function, saying it is true for all values of its argument [Russell]
6099 Modal terms are properties of propositional functions, not of propositions [Russell]
10. Modality / A. Necessity / 6. Logical Necessity
16490 Some facts about experience feel like logical necessities [Russell]
10. Modality / B. Possibility / 1. Possibility
22308 Only the actual exists, so possibilities always reduce to actuality after full analysis [Russell]
10. Modality / B. Possibility / 5. Contingency
21533 Contingency arises from tensed verbs changing the propositions to which they refer [Russell]
10. Modality / B. Possibility / 8. Conditionals / c. Truth-function conditionals
12197 Inferring q from p only needs p to be true, and 'not-p or q' to be true [Russell]
14450 All forms of implication are expressible as truth-functions [Russell]
10. Modality / B. Possibility / 9. Counterfactuals
22303 It makes no sense to say that a true proposition could have been false [Russell]
10. Modality / E. Possible worlds / 1. Possible Worlds / a. Possible worlds
5400 In any possible world we feel that two and two would be four [Russell]
14460 If something is true in all possible worlds then it is logically necessary [Russell]