You have chosen 'What is Logic?st1=Ian Hacking' by , 'Sapiens: brief history of humankind' by Yuval Noah Harari and 'Set Theory' by Kenneth Kunen
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 |