Combining Texts

You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'What Required for Foundation for Maths?' by John Mayberry and 'Symbolic Logic (with Langford)' by C.I. Lewis

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All the ideas for Knowledge Aims, or select a subheading:
      A. Knowledge
      B. Certain Knowledge
      C. Knowing Reality