Combining Texts

You have chosen 'Set Theory' by Kenneth Kunen, 'The iterative conception of Set' by George Boolos and 'Queries to the 'Opticks'' by Isaac Newton

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge