Combining Texts

You have chosen 'Proof of an External World' by G.E. Moore, 'De aequopollentia causae et effectus' by Gottfried Leibniz and 'Tarski's Theory of Truth' by Hartry Field

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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