Combining Texts

You have chosen 'Lectures on the History of Philosophy' by Georg W.F.Hegel, 'On the Foundations of Logic and Arithmetic' by David Hilbert and 'Theory of Knowledge (2nd ed 1977)' by Roderick Chisholm

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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