You have chosen 'Elucidation of some points in E.Schröder' by Gottlob Frege, 'The Principles of Mathematics' by Bertrand Russell and 'Modal Logic within Counterfactual Logic' by Timothy Williamson
start again | choose another area for these texts | all the ideas for this combination of texts| All the ideas for Natural Theory, or select a subheading: |
| A. | Speculations on Nature | |
| B. | Natural Kinds | |
| C. | Causation | |
| D. | Laws of Nature |