Combining Texts

You have chosen 'Principles of Theoretical Logic' by Hilbert,D/Ackermann,W, 'Alcibiades' by Anon (Plat) and 'Constructibility and Mathematical Existence' by Charles Chihara

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All the ideas for Mathematics, or select a subheading:
      A. Nature of Mathematics
      B. Foundations for Mathematics
      C. Sources of Mathematics