You have chosen 'Trees, Terms and Truth' by George Engelbretsen, 'Criterion of Validity in Reasoning' by Charles Sanders Peirce and 'Sets, Aggregates and Numbers' by Palle Yourgrau
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 |