You have chosen 'Frege's Theory of Numbers' by Charles Parsons, 'Grundlagen (Foundations of Theory of Manifolds)' by George Cantor and 'Metaphysical Foundations of Mathematics' by Gottfried Leibniz
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |