Combining Texts

You have chosen 'Summa totius logicae' by William of Ockham, 'Mental Files in Flux' by Franois Recanati and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell

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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