Combining Texts

You have chosen 'Stipulation, Meaning and Apriority' by Paul Horwich, 'Mathematics, Science and Language' by Luitzen E.J. Brouwer and 'Letter to G.H. Schaller' by Baruch de Spinoza

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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