You have chosen 'On Hippocrates and Plato' by Galen, 'Aristotle and Descartes on Matter' by Gottfried Leibniz and 'What are Sets and What are they For?' by Oliver,A/Smiley,T
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 |