Combining Texts

You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'De Ente et Essentia (Being and Essence)' by Thomas Aquinas and 'Beginning Logic' by E.J. Lemmon

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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