Combining Texts

You have chosen 'Frege's Theory of Numbers' by Charles Parsons, 'What do powers do when they are not manifested?' by Stathis Psillos and 'Positivism and Realism' by Moritz Schlick

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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