Combining Texts

You have chosen 'Presidential Address of Am. Math. Soc' by Oswald Veblen, 'Travels in Four Dimensions' by Robin Le Poidevin and 'Lecture on Applicability of Mathematics' by Steven Weinberg

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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