Combining Texts

You have chosen 'Lectures on the History of Philosophy' by Georg W.F.Hegel, 'Principles of Philosophy' by Ren Descartes and 'Enquiry concerning Principles of Morals' by David Hume

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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