Combining Texts

You have chosen 'Treatise on double arguments' by Anon (Diss), 'A Tour through Mathematical Logic' by Robert S. Wolf and 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton

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All the ideas for Knowledge Criteria, or select a subheading:
      A. Justification Problems
      B. Internal Justification
      C. External Justification
      D. Scepticism
      E. Relativism