You have chosen 'Aristotle and Descartes on Matter' by Gottfried Leibniz, 'Outline of a System of Utilitarianism' by J.J.C. Smart and 'Principles of Theoretical Logic' by Hilbert,D/Ackermann,W
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 |