You have chosen 'Frege's Theory of Numbers' by Charles Parsons, 'New System and Explanation of New System' by Gottfried Leibniz and 'Introduction to Zermelo's 1930 paper' by Michael Hallett
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |