Combining Texts

You have chosen 'Phenomenalism' by A.J. Ayer, 'Answer to 'What is Enlightenment?'' by Immanuel Kant and 'Mathematics, Science and Language' by Luitzen E.J. Brouwer

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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