Combining Texts

You have chosen 'The Value of Science' by Henri Poincaré, 'On the Source of Necessity' by Ross P. Cameron and 'The Roots of Reference' by Willard Quine

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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