Combining Texts

You have chosen 'In Praed.' by John Duns Scotus, 'Intuitionism: an Introduction' by Arend Heyting and 'What Required for Foundation for Maths?' by John Mayberry

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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