Combining Texts

You have chosen 'The Evolution of Modern Metaphysics' by A.W. Moore, 'Exigency to Exist in Essences' by Gottfried Leibniz and 'The Value of Science' by Henri Poincar

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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