Combining Texts

You have chosen 'Presidential Address of Am. Math. Soc' by Oswald Veblen, 'works' by David Hilbert and 'The Emperor's New 'Knows'' by Kent Bach

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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