Combining Texts

You have chosen 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz, 'Intention, Plans, and Practical Reason' by Michael Bratman and 'The Trouble with Possible Worlds' by William Lycan

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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