Combining Texts

Ideas for 'General Facts,Phys Necessity, and Metaph of Time', 'Introduction to Mathematical Philosophy' and 'Abstract of 'The Fourfold Root''

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4 ideas

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 / C. Sources of Modality / 1. Sources of Necessity

4192	All necessity arises from causation, which is conditioned; there is no absolute or unconditioned necessity [Schopenhauer]

10. Modality / E. Possible worlds / 1. Possible Worlds / a. Possible worlds

14460

If something is true in all possible worlds then it is logically necessary [Russell]