Combining Texts

Ideas for 'To be is to be the value of a variable..', 'Philosophical Logic' and 'Does Ontology Rest on a Mistake?'

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3 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]