You have chosen 'On boundary numbers and domains of sets' by Ernst Zermelo, 'Symbolic Logic (with Langford)' by C.I. Lewis and 'Knowledge and the State of Nature' by Edward Craig
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| A. | Classical Physics | |
| B. | Modern Physics | |
| C. | Space | |
| D. | Time | |
| E. | Cosmology | |
| F. | Chemistry | |
| G. | Biology |