Combining Texts

You have chosen 'Evil and Omnipotence' by J.L. Mackie, 'Against the Physicists (two books)' by Sextus Empiricus and 'Barcan Formulae' by Koen Vervloesem

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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