You have chosen 'Exigency to Exist in Essences' by Gottfried Leibniz, 'On the Foundations of Logic and Arithmetic' by David Hilbert and 'Proof that every set can be well-ordered' by Ernst Zermelo
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 |