You have chosen 'Mathematics and Indispensibility' by Elliott Sober, 'Title, Unity, Authenticity of the 'Categories'' by Michael Frede and 'On the Foundations of Logic and Arithmetic' by David Hilbert
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 |