You have chosen 'Principles of Philosophy' by Ren�� Descartes, 'Logical Analysis of Gestalt Concepts' by Rescher,N/Oppenheim,P and 'Foundations of Two-Dimensional Semantics' by David J.Chalmers
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| A. | Nature of Mathematics | |
| B. | Foundations for Mathematics | |
| C. | Sources of Mathematics |