Combining Texts

You have chosen 'Theory of Knowledge (2nd edn)' by Keith Lehrer, 'Presidential Address of Am. Math. Soc' by Oswald Veblen and 'Regressive Method for Premises in Mathematics' by Bertrand Russell

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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