You have chosen 'A Realistic Theory of Categories' by Roderick Chisholm, 'Sententia on 'De Caelo'' by Thomas Aquinas and 'Frege versus Cantor and Dedekind' by William W. Tait
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |