Combining Texts

You have chosen 'Logic (Encyclopedia I)' by Georg W.F.Hegel, 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell and 'Consistency and realism (with 1972 note)' by Bernard Williams

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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