You have chosen 'Popular Scientific Lectures' by Ernst Mach, 'Theory of Knowledge (2nd edn)' by Keith Lehrer and 'Opus Maius (major works)' by Roger Bacon
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 |