You have chosen 'On Plural Reference and Set Theory' by Helen Cartwright, 'Lectures on the Philosophy of Right' by Georg W.F.Hegel and 'Letter to Frege 29.12.1899' by David Hilbert
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |