Combining Texts

You have chosen 'Transworld Identity or worldbound Individuals?' by Alvin Plantinga, 'Freedom and Action' by Roderick Chisholm and 'Fact, Fiction and Forecast (4th ed)' by Nelson Goodman

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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