Combining Texts

You have chosen 'On the analysis of moral judgements' by A.J. Ayer, 'Possible Worlds' by David Lewis and 'Review of Chihara 'Struct. Accnt of Maths'' by John P. Burgess

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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