Combining Texts

You have chosen 'Explaining Explanation' by David-Hillel Ruben, 'Proof that every set can be well-ordered' by Ernst Zermelo and 'Principles of Philosophy' by Ren Descartes

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All the ideas for Action, or select a subheading:
      A. Definition of Action
      B. Preliminaries of Action
      C. Motives for Action