Combining Texts

You have chosen 'The Actual and the Possible' by Alexander R. Pruss, 'Speaking of Objects' by Willard Quine and 'Tonk, Plonk and Plink' by Nuel D. Belnap

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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