You have chosen 'Purifications (frags)' by Empedocles, 'Logic [1897]' by Gottlob Frege and 'Wittgenstein's 'Tractatus Logico-Philosophicus'' by Roger M. White
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 |