You have chosen 'The Aim and Structure of Physical Theory' by Pierre Duhem, 'Rules for the Direction of the Mind' by Ren Descartes and 'Iteration Again' by George Boolos
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 |