Combining Texts
Ideas for
'Theory of Knowledge (2nd edn)', 'Treatise of Human Nature' and 'Introduction to Mathematical Philosophy'
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5 ideas
10. Modality / A. Necessity / 10. Impossibility
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Nothing we clearly imagine is absolutely impossible [Hume]
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10. Modality / A. Necessity / 11. Denial of Necessity
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Necessity only exists in the mind, and not in objects [Hume]
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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 / 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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