You have chosen 'Mathematical logic and theory of types' by Bertrand Russell, 'On the spiritual perfection of life' by Thomas Aquinas and 'Investigations into Logical Deduction' by Gerhard Gentzen
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 |