Combining Texts

You have chosen 'The Passions of the Soul' by Ren�� Descartes, 'The Problem of Natural Laws' by L. Jonathan Cohen and 'Existence,Ontological Commitment and Fictions' by Peter van Inwagen

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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