Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Pacidius Philalethi dialogue' by Gottfried Leibniz and 'Lecture on Nominalism' by Willard Quine

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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