Combining Texts

You have chosen 'Mind and Its Place in Nature' by C.D. Broad, 'Varieties of Causation' by Ernest Sosa and 'Elucidation of some points in E.Schrder' by Gottlob Frege

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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