You have chosen 'On boundary numbers and domains of sets' by Ernst Zermelo, 'The Later Works (17 vols, ed Boydston)' by John Dewey and 'The iterative conception of Set' by George Boolos
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |