Combining Texts

You have chosen 'The Periodic Table' by Eric R. Scerri, 'Criterion of Validity in Reasoning' by Charles Sanders Peirce and '(Nonsolipsistic) Conceptual Role Semantics' 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