Combining Texts

You have chosen 'Lectures 1930-32 (student notes)' by Ludwig Wittgenstein, 'The Ages of the World' by Friedrich Schelling and 'The Architecture of Mathematics' by Nicholas Bourbaki

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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