Combining Texts

You have chosen 'Open Society and Its Enemies:Hegel and Marx' by Karl Popper, 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer and 'Many Politics' by Gilles Deleuze

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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