You have chosen 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo, 'Letters to Wagner' by Gottfried Leibniz and 'On the Nature of Truth and Falsehood' by Bertrand Russell
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 |