Combining Texts

You have chosen 'The Rationality of Science' by W.H. Newton-Smith, 'Letter to Frege 29.12.1899' by David Hilbert and 'To be is to be the value of a variable..' by George Boolos

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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