Combining Texts
Ideas for
'67: Platonic Questions', 'The Fourth Revolution' and 'Introduction to Mathematical Philosophy'
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3 ideas
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 / E. Possible worlds / 1. Possible Worlds / a. Possible worlds
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If something is true in all possible worlds then it is logically necessary [Russell]
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