You have chosen 'The Value of Science' by Henri Poincaré, 'The Logic of Scientific Discovery' by Karl Popper and 'On the Nature of Mathematical Reasoning' by Henri Poincar
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 |