Combining Texts

You have chosen 'Axiomatic Theories of Truth (2005 ver)' by Volker Halbach, 'Real Natures and Familiar Objects' by Crawford L. Elder and 'A Realistic Theory of Categories' by Roderick Chisholm

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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