You have chosen 'Mental Acts: their content and their objects' by Peter Geach, 'First-order Logic, 2nd-order, Completeness' by Marcus Rossberg and 'Conjectures and Refutations' by Karl Popper
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 |