Combining Texts

You have chosen 'A Discourse on Method' by René Descartes, 'A Powers Theory of Modality' by Jonathan D. Jacobs and 'Against the Ethicists (one book)' by Sextus Empiricus

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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