You have chosen 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo, 'There are no ordinary things' by Peter Unger and 'The Barcan Formula and Metaphysics' by Ori Simchen
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 |