You have chosen 'New Scientist articles' by New Scientist writers, 'Grundlagen der Arithmetik (Foundations)' by Gottlob Frege and 'Principles of Nature and Grace based on Reason' by Gottfried Leibniz
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 |