Combining Texts

You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'The Logical Structure of the World (Aufbau)' by Rudolph Carnap and 'Letters to Thomas Burnett' by Gottfried Leibniz

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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