Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'Probabilistic Causality' by Wesley Salmon and 'Presidential Address of Am. Math. Soc' by Oswald Veblen

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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