You have chosen 'New Proof of Possibility of Well-Ordering' by Ernst Zermelo, 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz and 'Summa' by Eustachius a Sancto Paulo
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 |