You have chosen 'The Evolution of Logic' by William D. Hart, 'Axiomatic Theories of Truth (2005 ver)' by Volker Halbach and 'Platonism and the Spiritual Life' by George Santayana
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 |