Combining Texts

You have chosen 'On the General Idea of Proof Theory' by Dag Prawitz, 'Outlines of Pyrrhonism' by Sextus Empiricus and 'Causality: Production and Propagation' by Wesley Salmon

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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