You have chosen 'Opus Maius (major works)' by Roger Bacon, 'Proof that every set can be well-ordered' by Ernst Zermelo and 'Could There Be Unicorns?' by Michael Dummett
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 |