Combining Texts

You have chosen 'Scientific Explanation' by R.B. Braithwaite, 'Reply to First Objections' by Ren Descartes and 'Probability and Logic of Rational Belief' by Henry E. Kyburg Jr

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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