You have chosen 'Survival and Identity, with postscript' by David Lewis, 'An Axiomatization of Set Theory' by John von Neumann and 'On the Source of Necessity' by Ross P. Cameron
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| A. | Classical Physics | |
| B. | Modern Physics | |
| C. | Space | |
| D. | Time | |
| E. | Cosmology | |
| F. | Chemistry | |
| G. | Biology |