You have chosen 'Elements of Mathematical Logic' by Jan Lukasiewicz, 'The Methods of Ethics (7th edn)' by Henry Sidgwick and 'Sense Data and the Percept Theory' by Roderick Firth
start again | choose another area for these texts | all the ideas for this combination of texts| All the ideas for Existence, or select a subheading: |
| A. | Nature of Existence | |
| B. | Change in Existence | |
| C. | Structure of Existence | |
| D. | Theories of Reality | |
| E. | Categories |