You have chosen 'Identity in Substances and True Propositions' by Gottfried Leibniz, 'On the Foundations of Logic and Arithmetic' by David Hilbert and 'On What There Is' by Willard Quine
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 |