Combining Texts

You have chosen 'Intuitionism and Formalism' by Luitzen E.J. Brouwer, 'First-Order Logic' by Wilfrid Hodges and 'Hat-Tricks and Heaps' by William D. Hart

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories