You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'Substitutional Classes and Relations' by Bertrand Russell and 'Does Emp.Knowledge have Foundation?' by Wilfrid Sellars
start again | choose another area for these texts | all the ideas for this combination of texts| All the ideas for Modality, or select a subheading: |
| A. | Necessity | |
| B. | Possibility | |
| C. | Sources of Modality | |
| D. | Knowledge of Modality | |
| E. | Possible worlds |