You have chosen 'Nominalism and Substitutional Quantifiers' by Ruth Barcan Marcus, 'Protocol Sentences' by Otto Neurath and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell
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 |