You have chosen 'The Trouble with Possible Worlds' by William Lycan, 'Letter to Frege 29.12.1899' by David Hilbert and 'Morality as system of hypothetical imperatives' by Philippa Foot
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 |