Combining Texts

You have chosen 'The Case against Closure (and reply)' by Fred Dretske, 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer and 'Launching Points to the Realm of the Mind' by Porphyry

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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