You have chosen 'Exigency to Exist in Essences' by Gottfried Leibniz, 'Nature and Meaning of Numbers' by Richard Dedekind and 'On the Conservation of Force' by Hermann von Helmholtz
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| A. | Classical Physics | |
| B. | Modern Physics | |
| C. | Space | |
| D. | Time | |
| E. | Cosmology | |
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