You have chosen 'A Structural Account of Mathematics' by Charles Chihara, 'On the Conservation of Force' by Hermann von Helmholtz and 'On the Syllogism IV' by Augustus De Morgan
start again | choose another area for these texts | all the ideas for this combination of textsAll the ideas for Modality, or select a subheading: |
A. | Necessity | |
B. | Possibility | |
C. | Sources of Modality | |
D. | Knowledge of Modality | |
E. | Possible worlds |