Combining Texts

You have chosen 'Letter to the Editor about Bayle' by Gottfried Leibniz, 'Human Freedom and the Self' by Roderick Chisholm and 'Rules for the Direction of the Mind' 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