Combining Texts

You have chosen 'Mathematics and Indispensibility' by Elliott Sober, 'Groundwork of the Metaphysic of Morals' by Immanuel Kant and 'On Anger (Book 3)' by Seneca the Younger

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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