You have chosen 'Grundlagen der Arithmetik (Foundations)' by Gottlob Frege, 'Principles of Nature and Grace based on Reason' by Gottfried Leibniz and 'Principle Doctrines ('Kuriai Doxai') (frags)' by Epicurus
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 |