Combining Texts

You have chosen 'Why Constitution is not Identity' by Lynne Rudder Baker, 'On the Nature of the Gods ('De natura deorum')' by M. Tullius Cicero and 'works' by Ren Descartes

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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