Combining Texts

You have chosen 'Mathematics without Numbers' by Geoffrey Hellman, 'Kant and the Critique of Pure Reason' by Sebastian Gardner and 'What is Cantor's Continuum Problem?' by Kurt Gdel

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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