You have chosen 'The Evolution of Logic' by William D. Hart, 'Preface to 'Principles of Philosophy'' by Ren Descartes and 'Grundlagen der Arithmetik (Foundations)' by Gottlob Frege
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 |