Combining Texts

You have chosen 'Being and Time' by Martin Heidegger, 'Causal Powers' by Harr,R./Madden,E.H. and 'On the General Idea of Proof Theory' by Dag Prawitz

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All the ideas for Mathematics, or select a subheading:
      A. Nature of Mathematics
      B. Foundations for Mathematics
      C. Sources of Mathematics