Combining Texts

You have chosen 'A Résumé of Metaphysics' by Gottfried Leibniz, 'True in Theory, but not in Practice' by Immanuel Kant and 'Whitehead and the Rise of Modern Logic' 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