Combining Texts

You have chosen 'Individuals without Sortals' by M.R. Ayers, 'Title, Unity, Authenticity of the 'Categories'' by Michael Frede and 'The Inference to the Best Explanation' by Gilbert Harman

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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