Combining Texts

Ideas for 'fragments/reports', 'Introduction to Mathematical Philosophy' and 'A Survey of Metaphysics'

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5 ideas

10. Modality / B. Possibility / 1. Possibility

4195	It is impossible to reach a valid false conclusion from true premises, so reason itself depends on possibility [Lowe]

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

4207	We might eliminate 'possible' and 'necessary' in favour of quantification over possible worlds [Lowe]

14460

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