You have chosen 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo, 'On the True Doctrine (Against Christians)' by Celsus and 'Preface to 'Principles of Philosophy'' by Ren Descartes
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 |