You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'Letters to Leibniz 1' by Isaac Newton and 'On the Nature of Mathematical Reasoning' by Henri Poincar
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 |