You have chosen 'Material Beings' by Peter van Inwagen, 'Grundgesetze der Arithmetik 1 (Basic Laws)' by Gottlob Frege and 'Opus Maius (major works)' by Roger Bacon
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 |