Combining Texts

Ideas for 'On the Philosophy of Logic', 'Introduction to Mathematical Philosophy' and 'Logic [1897]'

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6 ideas

10. Modality / B. Possibility / 1. Possibility

8941	We can't explain 'possibility' in terms of 'possible' worlds [Fisher]

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]

8947	If all truths are implied by a falsehood, then not-p might imply both q and not-q [Fisher]

10. Modality / B. Possibility / 8. Conditionals / d. Non-truthfunction conditionals

8949	In relevance logic, conditionals help information to flow from antecedent to consequent [Fisher]

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]