Combining Philosophers

Ideas for Michael Burke, John Bigelow and John P. Burgess

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5 ideas

10. Modality / A. Necessity / 4. De re / De dicto modality

15420

De re modality seems to apply to objects a concept intended for sentences [Burgess]

10. Modality / A. Necessity / 6. Logical Necessity

15419

General consensus is S5 for logical modality of validity, and S4 for proof [Burgess]

15417

Logical necessity has two sides - validity and demonstrability - which coincide in classical logic [Burgess]

10. Modality / B. Possibility / 8. Conditionals / a. Conditionals

15422

Three conditionals theories: Materialism (material conditional), Idealism (true=assertable), Nihilism (no truth) [Burgess]

15423

It is doubtful whether the negation of a conditional has any clear meaning [Burgess]