You have chosen 'Exigency to Exist in Essences' by Gottfried Leibniz, 'An Axiomatization of Set Theory' by John von Neumann and 'Two Problems of Epistemology' by Karl Popper
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |