Combining Texts

You have chosen 'Intro to 'Philosophy of Logic'' by Dale Jacquette, 'The Nature of Mathematics' by Charles Sanders Peirce and 'Elucidation of some points in E.Schrder' by Gottlob Frege

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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