You have chosen 'Science and Method' by Henri Poincaré, 'New System and Explanation of New System' by Gottfried Leibniz and 'On the General Idea of Proof Theory' by Dag Prawitz
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 |